2024 Carpenter 158 vs 9310

15/16" x 144" Stainless Steel Carpenter 158 GP. Weight: ~ 30.29 Lbs/pp. Price: $211/pp. THIS MATERIAL IS IMMEDIATELY AVAILABLE. *photo is not of actual material.If fact, 9310 response to thin section quenching is better that Carpenter 158. And, taking the leap between this statement:". . . by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are detrimental to fatigue while not being evident in the physical properties . . ." and this statement:Apr 13, 2012 Messages 156 Location Goose Creek, S.C. Think I read somewhere that 9310 was stronger...but more likely to break wit alot of abuse due to 158 having some give Jul 26, 2013 #3 Paco Well-Known Member Joined May 1, 2012 Messages 358 LocationFor instance; PSA, Aero Precision - both DPMS pattern- offer receivers, barrels, BCG's on their websites. What if I want to get a 3rd party BCG because of different specs - carpenter 158 vs 9310 bolt. Then - I assume the AR10 BCG will not run in …Nov 16, 2017 · C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel. 9310 is about half the cost of P-6. Which is better? Don't know, I barely made it through that class. IMO, the heat treat is probably more important than the alloy comp. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.Sep 22, 2021 ... HRC of 46 yields a 15% increase in hardness at the same toughness comparing to Carpenter 158 & 9310 ... or Carpenter 465 would be good materials ...Carpenter 158 is 9310 with case hardening It's not, Carpenter 158 is a propitiatory steel alloy. It has similar (arguably superior) properties to 9310 but it is not 9310. Can somebody tell me what the difference is between c-158 and 9310 and why 9310 isn't mil-spec? I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior? · I think 9310 has more molybdenum and C-158 and P-6 machine steel is the same and has more nickel and chrome. I think C-158 has to be bought in larger bulk …Jan 16, 2021 · Been examining the differences between C158 and 9310 steel bolts for the AR platform, and now I'm more confused than before. C158 is supposed to technically be stronger than 9310, but many higher end BCG makers are now using 9310 instead of C158 for their bolts b/c they say 158 is antiquated and they have figured out how to make 9310 better than "mil-spec." Faxon uses 9310 in their bolts and ... I’d like to think that if you don’t have an issue with your BCG, then it’s probably a good one. One of the guys in my shooting group, Brandon, runs a DD BCG on his 11.5-inch AR-15 and has never had an issue. Even when the guys with the Gucciest bolt carrier groups were. 5. Sionics NP3 Bolt Carrier Group.9310 is a standard. Carpenter 158 is proprietary alloy, and no real difference from 9310 in effective use of weaponry in a bolt. The difference between C-158 and 9310, I just don't see it. There is no evidence, let alone testing differences to the practical extent that it …Wilson combat 9310 steel - on sale for $98.57. BCGs are coming down in price and I want to buy a couple of good quality ones while prices are good. I have a Palmetto State Armory premium 158 Carpenter steel bolt carrier group on the way, I ordered it last week for $109. The other BCG I was looking at was the Rainier Arms for $119 and a lifetime ...All Toolcraft BCG bolts are shot-peened, MPI and batch HPT to ensure quality and reliability. Made from either mil-spec Carpenter 158 steel or high strength 9310 steel, bolt carrier groups from Toolcraft are guaranteed to perform like new for thousands and thousands of rounds. You cannot buy a better bolt carrier group than a Toolcraft.Feb 15, 2020 · The difference is in the steel. Many manufacturers will state that properly heat treated 9310 is approximately 7-8% "stronger" than 158, but 9310 requires that it be heat treated properly to achieve that increase in strength. Carpenter 158 is mil-spec, but many companies nowadays are opting for "stronger" steels like 9310 and S7 which are both ... Quoted: As I understand it, Carpenter 158 is a case (surface) hardened steel where 8620 is through hardened. This would allow C-158 to be very hard on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 being through hardened can either be softer ...Carpenter 158 was what was spec'd in the 1950's when the rifle was made. One company in the world makes it, and it's Carpenter. Other metal alloys have come along since 1950-whatever that are definitely superior, I think 9310 is fine. So is polishing a radius on the cam pin hole in the bolt, which is where the cracks usually happen.C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel. 9310 is about half the cost of P-6. Which is better? Don't know, I barely made it through that class. IMO, the heat treat is probably more important than the alloy …Nov 16, 2013 · Can somebody tell me what the difference is between c-158 and 9310 and why 9310 isn't mil-spec? I've seen 9310 used in some bolts and wonder if it's actually …Woodpeckers are a common predator of carpenter bees and their larvae. Some species of bee fly, or Bombyliidae, are also known to prey on carpenter bees through parasitoidism. Predators of bees in general include spiders, assassin bugs, wasp...The Relia-Bolt™ is machined from S7 tool steel and tempered with SRC’s proprietary heat-treating process, significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75% increase in tensile strength, and nearly 60% improvement in yield strength.-See it at Sharps here. Low Plasticity Roller Ball Burnishing:by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are detrimental to fatigue while not being evident in the physical properties. It has become evident from the industry that a number of manufacturers have jumped upon the AISI 9310 wagon in order to claim better performance. Jan 14, 2020 · The Relia-Bolt™ is machined from S7 tool steel and tempered with SRC’s proprietary heat-treating process, significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75% increase in tensile strength, and nearly 60% improvement in yield strength.-See it at Sharps here. Low Plasticity Roller Ball Burnishing: Barrel Length: 16" Gas System: Mid-LengthBarrel Profile: A2 StyleBarrel Steel: 4150V Chrome MolyBarrel Finish: NitrideChrome Lining: NoMuzzle Thread: 1/2-28Chamber: 5.56 NATOTwist Rate: 1 in 7"Barrel Extension: M4Diameter at Gas Block: .750" Gas Block Type: Low-profileMuzzle Device: A2 Flash HiderReceiver Material: Forged 7075 T6Receiver Type: M4Handguard Type: PSA 13.5" Lightweight M-Lok Free ...Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.Woodpeckers are a common predator of carpenter bees and their larvae. Some species of bee fly, or Bombyliidae, are also known to prey on carpenter bees through parasitoidism. Predators of bees in general include spiders, assassin bugs, wasp...Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Nov 16, 2013 · Now the bolts, they are made with AISI 9310 Steel, 9310 is better suited for an application such as a M16 bolt. 9310 is a steel typically used for gears, cams and …Carpenter No. 158 Bolt Steel. Carpenter No. 158 steel is the mil-spec steel used for fabricating the bolt itself. This type of steel is more expensive than 9310 (another popular steel used for the bolt and carrier), but it provides the best performance and lifespan for the BCG.The most common steel used in the bolt is Carpenter 158 steel. Some manufactures are using 9310 steel. Which is better? It depends who you ask, but most will agree that the difference in steel is small, and both varieties of steel work just fine. Many manufacturers also “shot peen” their bolts.For the bolt 158 or 9310 is what you want 9310 is about 8% stronger if that matters to you. 9310 would be better if you can find one that said 158 is the milspec so that will work too. I like above milspec whenever possible. For the carrier 8620 or a good SS, you could do carriers in 9310 but it would be $$$$$C 158 vs 9310 Bolt Just ordered a Aero Precision 6.5 bcg with bolt. Bolt is made of 158 carpenter instead of the 9310 i notice most others are. Is the 158 going to ...Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior? Carpenter 158 Vs. 9310 - Page 119310 has a better charpy rating which should help to keep the lugs from ripping off the body of the bolt. From what I understand is what is said above. 158 has to be bought in bulk to make it worth while and affordable. The 9310 is cheaper to buy in smaller quantities.On the other hand, Carpenter 158 steel is chosen for its toughness, shock resistance, and fatigue strength. As such, it sees use in firearm components, gears, shafts, and general machinery. What Is the Difference Between 9310 Steel and 8620 Steel? 9310 steel and 8620 steel are low-alloy steels with some key differences between them.Posted on 1/16/21 at 2:25 pm. 1 0. Been examining the differences between C158 and 9310 steel bolts for the AR platform, and now I'm more confused than before. C158 is supposed to technically be stronger than 9310, but many higher end BCG makers are now using 9310 instead of C158 for their bolts b/c they say 158 is antiquated and they have ...Barrel Length: 16" Gas System: Mid-LengthBarrel Profile: A2 StyleBarrel Steel: 4150V Chrome MolyBarrel Finish: NitrideChrome Lining: NoMuzzle Thread: 1/2-28Chamber: 5.56 NATOTwist Rate: 1 in 7"Barrel Extension: M4Diameter at Gas Block: .750" Gas Block Type: Low-profileMuzzle Device: A2 Flash HiderReceiver Material: Forged 7075 T6Receiver Type: M4Handguard Type: PSA 13.5" Lightweight M-Lok Free ... Jul 4, 2023 · It’s MPI tested and otherwise mil-spec…except that the bolt is made of 9310 steel instead of Carpenter 158. The chances of that mattering for an average shooter that puts even a few thousand rounds downrange a year is super slim. In the back of your mind, you’ll know it’s not mil-spec…but it’s about half the price of the BCM. 9310 G93106 52100 G52986 ACUBE® 100 Carpenter 158 T51606 CBS-223 CBS-50 NiL K91231 M-50 T11350 CBS-600 K21940 ... Carpenter Acube® 100, Custom Age 625 Plus®, Custom Age 725®, Free-Cut Invar “36”®, High Permeability “49”®, HyMu “80”®, Invar “36”®, ...Black Nitride AR15 Bolt made from Carpenter 158 steel. The bolts are also Shot Peened and MPI (Magnetic Particle Inspected) and feature Billet Machined ...9310 or Carpenter 158 Steel: Bolt Finish: Nickel Boron: Caliber: 223/5.56/300 Blackout: Extractor O-ring: Viton; Mil Spec: Carrier Material: 8620 Steel, Toolcraft Proprietary: Carrier Finish: Nickel Boron: Carrier Design: M16 Full Auto Style: Gas Key Material: 4130 Steel: Cam Pin Material: 4140 Steel:Carrier made with 8620 Steel and bolt made from Carpenter 158 Steel which is USGI Spec. ... Nitride VS. Chrome Lined - Which is better? Connect with Us: © 2023 ...kbd512. · #7 · Jun 24, 2014. I believe that the SAE 9310 steel is either slightly superior or slightly inferior to Carpenter 158 steel, in terms of tensile strength. The heat treatment process must be more closely controlled with 9310, from what I've read.The Carpenter 158 has to be purchased in 20,000 Lb lots and is roughly $5/Lb. So I was wondering if there was another type of material out there that had the same chemical properties as the Carpenter 158, but could be purchased in smaller quantities (i.e. 1000 Lbs?)3. Toolcraft LOGO’D Premium 5.56 Nickel Boron BCG W/ Carpenter 158 Bolt. Number 3 on this list of the best PSA BCGs is the Toolcraft Logo’d Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt. Now you may be saying to yourself, that this is a Toolcraft BCG not a PSA BCG, but here’s the deal, Toolcraft makes a lot of BCGs for …Mar 7, 2013 · Quoted: As I understand it, Carpenter 158 is a case (surface) hardened steel where 8620 is through hardened. This would allow C-158 to be very hard on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 being through hardened can either be softer ... C158 minus proprietary source + molybdenum = 9310, a slightly stronger steel with lower quench rates to be come hard and less likely to become brittle than C158. C158 bolt breakages are the biggest failure point for the AR-15 bolt carrier group, and is the biggest reason why C158 is not widely used outside of the AR-15. C 158 vs 9310 Bolt Just ordered a Aero Precision 6.5 bcg with bolt. Bolt is made of 158 carpenter instead of the 9310 i notice most others are. Is the 158 going to ... Toolcraft BCGs are generally available with bolts made from either 9310 or Carpenter 158 steel. They are batch High Pressure Tested (HPT) and every bolt is Magnetic Particle Inspected (MPI). Markings on the bolts vary with some being marked MP or MPI and some being marked 9310 or C158.by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are detrimental to fatigue while not being evident in the physical properties. It has become evident from the industry that a number of manufacturers have jumped upon the AISI 9310 wagon in order to claim better performance.Where are you seeing bolts made from 8620, or carriers and keys made from C158 or 9310? The BCM website states the bolt is made from C158. PSA states this as well. The Nickel Boron BCG I was interested in, made by Ground Zero Precision, states the carrier is 8620 steel, bolt is C158, and the cam pin is 4340 steel.C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel. 9310 is about half the cost of P-6. Which is better? Don't know, I barely made it through that class. IMO, the heat treat is probably more important than the alloy …Jan 14, 2020 · The Relia-Bolt™ is machined from S7 tool steel and tempered with SRC’s proprietary heat-treating process, significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75% increase in tensile strength, and nearly 60% improvement in yield strength.-See it at Sharps here. Low Plasticity Roller Ball Burnishing: HRC of 46 yields a 15% increase in hardness at the same toughness comparing to Carpenter 158 & 9310 Mil-Spec Extractor and Ejector Springs, Gas Rings While the two bolts have identical construction, the two coatings vary slightly. Here’s the information on both the DLC and NiB-X coatings. Technical Data on DLC Coating …Those pits rusted and cracked more until the bolt failed. There is a long article on the internet somewhere..Google. 158 was chosen as a better material to replace 8620, 9310 was not around then, the standard has not been changed. Both 158 and 9310 can be had in a VAC melt grade which is the purest form of both alloys.Perhaps this is the wrong outlet to make this question, but can anyone tell me the difference in reliability and longevity between a bolt made from 9310 steel and Carpenter 158 steel? Does one resist shearing better but is more brittle, I assume something along those lines is the difference.This, c158 has to be purchased in massive quantities, while 9310 can be purchase in a quantity more reasonable for a small company. Can also hold up to the stress a bolt is put under as well as 158 with proper heat treating. View All Quotes. better actually however, the heat treating must be done right.May 13, 2013 · Those pits rusted and cracked more until the bolt failed. There is a long article on the internet somewhere..Google. 158 was chosen as a better material to replace 8620, 9310 was not around then, the standard has not been changed. Both 158 and 9310 can be had in a VAC melt grade which is the purest form of both alloys. Jan 16, 2021 · Been examining the differences between C158 and 9310 steel bolts for the AR platform, and now I'm more confused than before. C158 is supposed to technically be stronger than 9310, but many higher end BCG makers are now using 9310 instead of C158 for their bolts b/c they say 158 is antiquated and they have figured out how to make 9310 better than "mil-spec." Faxon uses 9310 in their bolts and ... The heat treatment process must be more closely controlled with 9310, from what I've read. I'm pretty sure Aermet 100 is a better steel than Carpenter 158 or SAE 9310. It's also made by Carpenter Technology Corporation. The Aermet 100 is about 3 times more expensive than Carpenter 158, but doesn't have lot minimums.Jul 25, 2013 · The truth is, the standard Mil-spec C-158 (Carpenter 158) bolt has a number of factors limiting its performance, not the least of which is that the life expectancy of such bolts is only about 6,000 rounds. In fact, standard bolts will start to show stress cracks on the locking lugs adjacent to the extractor cut after only 3,000 rounds. Wilson combat has a 9310 steel Bolt Carrier Group on sale for $98.57, which is something like $70 off regular price. The three main BCGs I am looking at right now: PSA premium 158 Carpenter - was on sale for $109 when I put my order in Rainier Arms 158 Carpenter - on sale for $119 Wilson combat 9310 steel - on sale for $98.57.Cabinet design software has become an essential tool for designers, carpenters, and homeowners who want to create custom cabinets. However, not everyone has the budget to invest in expensive software.Nov 14, 2013 · Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 11-14-13, 18:32 #11. Mr blasty. View Profile View Forum Posts View Articles Member Join Date ... The Relia-Bolt™ is machined from S7 tool steel and tempered with SRC’s proprietary heat-treating process, significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75% increase in tensile strength, and nearly 60% improvement in yield strength. Batch MPI and HPT testedI've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior? Carpenter 158 Vs. 9310 - Page 11May 13, 2013 · Those pits rusted and cracked more until the bolt failed. There is a long article on the internet somewhere..Google. 158 was chosen as a better material to replace 8620, 9310 was not around then, the standard has not been changed. Both 158 and 9310 can be had in a VAC melt grade which is the purest form of both alloys. Jan 14, 2020 · The Relia-Bolt™ is machined from S7 tool steel and tempered with SRC’s proprietary heat-treating process, significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75% increase in tensile strength, and nearly 60% improvement in yield strength.-See it at Sharps here. Low Plasticity Roller Ball Burnishing: Aug 21, 2019 · Bren · #2 · Aug 21, 2019. I looked at a couple of PSA kits recently and the only difference was that one had a 9310 bolt and one had a C158. I doubt it makes any difference, but the C158 is the mil spec, so it has been tried and tested a lot more for a lot longer, so I went with that. by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are detrimental to fatigue while not being evident in the physical properties. It has become evident from the industry that a number of manufacturers have jumped upon the AISI 9310 wagon in order to claim better performance.Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or ...9310 Carrier/Bolt Steel. This is superior to 8620. Its development came after the AR15 was originally designed. This steel provides enhanced heat and pressure resistance. The tensile strength is 910 MPa, and the yield strength is 570 MPa. You will sometimes find that 9310 steel is used in the forging of both carrier and bolt. Carpenter …Though Carpenter 158 and 8620 steel are used for making Mil-Spec AR-15s, M4s, and M16s, many commercial manufacturers also use other materials. For instance, Faxon Firearms use 9310 Steel bolts for their BCG, and V Seven Weapon System offers a bolt carrier in Grade 5 Titanium. These materials are actually stronger than Mil-Spec steel and are ... 8620, 9310 vs A2. Have issues with 8620 deep case carburized pins, spalling by bearing rollers and have tried 9310 with better results because of the higher core hardness but 9310 barely meets the hardness spec of 60/62 Rc (after finish grinding). Thinking about a tool steel with high toughness like A2 which would easily meet the …Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. In a rifle bolt there are only two things we need to be concerned with: the physical properties of the steel (hardness, strength, elasticity, etc), and shape. The physical properties of Carpenter 158 and 9310 are similar, and as long as the finished product passes gauging. the shape is correct.Nov 8, 2016 · Where are you seeing bolts made from 8620, or carriers and keys made from C158 or 9310? The BCM website states the bolt is made from C158. PSA states this as well. The Nickel Boron BCG I was interested in, made by Ground Zero Precision, states the carrier is 8620 steel, bolt is C158, and the cam pin is 4340 steel. As to the argument about 9310 not being mil-spec for the bolt, that's true. But, properly done 9310, as with one of the suppliers listed is at least as good. Mil-spec does not always mean better, sometimes it does. Toolcraft offere both 9310 & C-158. The others offer only 9310,,It’s MPI tested and otherwise mil-spec…except that the bolt is made of 9310 steel instead of Carpenter 158. The chances of that mattering for an average shooter that puts even a few thousand rounds downrange a year is super slim. In the back of your mind, you’ll know it’s not mil-spec…but it’s about half the price of the BCM.Nov 14, 2013 · 11-14-13, 06:26 #1 eperk Member Join Date Aug 2012 Location Northeast MS. Posts 460 Feedback Score 0 Carpenter 158 Vs. 9310 Can somebody tell me what the difference is between c-158 and 9310 and why 9310 isn't mil-spec? I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior? Sep 29, 2014 ... The interesting thing about Carpenter 158 is that it is a ... For instance, some manufacturers use 9310 or 8620 steels to make bolts. The ...Thread: Carpenter 158 Vs. 9310. Thread Tools. Show Printable Version; 04-29-17, 14:46 #121. AR-556. View Profile View Forum Posts View Articles Member Join Date ...Np. The firearmhistory had some great info. I suppose can 9310 be a better bolt material than C158, sure but it has to be heat treated properly in order to do so, and the improvement is less than 8%. So, as always, better make sure you're buying from a reputable manufacturer. I wouldn't pursue a 9310 bolt simply for the sake of having one made out …May 12, 2016 · It has been the "Mil-Spec" since. Since the creation of Carpenter 158, the metals industry has continued to innovate, creating new blends of steels. 9310 is a AISI standard grade of tool steel that makes it about ~7% stronger than "mil-spec" Carpenter 158 steels, when appropriately treated. Bolt Carriers made from 8620 Steel, 6A1-4V Titanium or Aluminum. Keys made from 4130 Steel. Bolts available in 9310 Steel or Carpenter 158. Our products carry a lifetime warranty. Simply put Should any of our products fail, …PSA Logoed Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt - 516446450 . Rating: 94%. Regular Price $199.99 Special Price $99.99. Add to Cart. Add to Wish ...Perhaps this is the wrong outlet to make this question, but can anyone tell me the difference in reliability and longevity between a bolt made from 9310 steel and Carpenter 158 steel? Does one resist shearing better but is more brittle, I assume something along those lines is the difference.All Toolcraft BCG bolts are shot-peened, MPI and batch HPT to ensure quality and reliability. Made from either mil-spec Carpenter 158 steel or high strength 9310 steel, bolt carrier groups from Toolcraft are guaranteed to perform like new for thousands and thousands of rounds. You cannot buy a better bolt carrier group than a Toolcraft.

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Aug 21, 2020 ... ... 158-carpenter-sp-hpt-mpi/ Specs: Sons of Liberty Gun Works Bolt ... (vs 4140), Heat treated Shot peen per ASTM B851/SAE AMS2430S. Extractor ...AXIAL FATIGUE VS 9310 Maximum Stress Level (ksi) Nf, Cycles to Failure 200 180 160 140 100 120 80 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08 AXIAL FATIGUE PROPERTY DATA Ferrium C61 9310 Kt = 1.0, R = 0.10 Shot peened 0.30 in. gage diameter LongitudinalOct 21, 2013 ... ... or to resale we'll call them company 1 and 2. ... But that does not mean that the Carpenter 158 is better than the 9310 bolt because it isn't.Posted: 7/17/2014 3:12:39 PM EDT. Sharps' Relia-Bolt has significantly come down on its price since its unveiling around the first of the year due to now being only $79.99. Being an S7 tool steel bolt with a NP3 finish for a hair less than $80, I decided to order one to try out in my upcoming build. I ordered it early Monday Morning, it shipped ...[#1] This is a debated topic. 9310 is supposed to be harder and more durable if heat treated correctly. They get a bad rap because when they first hit the market there were a lot that were not heat treated correctly and failed C158 is the Mil spec standard with a long track record of reliability. It is usually the most desiredNov 17, 2021 ... ... 9310 steel and is magnetic particle inspected, features a nitride finish. On ... last a lot longer than a Carpenter 158 bolt. It's a stronger ...Jun 4, 2016 · 9310 has a better charpy rating which should help to keep the lugs from ripping off the body of the bolt. From what I understand is what is said above. 158 has to be bought in bulk to make it worth while and affordable. The 9310 is cheaper to buy in smaller quantities. Survivalist. It's my understanding that the 158 is mil spec for the bolt, 8620 is spec for the carrier and 9310 is less than 10% harder than the 158. I think I've read somewhere that 158 was a proprietary from one company and that it is case hardened.9310 G93106 52100 G52986 ACUBE® 100 Carpenter 158 T51606 CBS-223 CBS-50 NiL K91231 M-50 T11350 CBS-600 K21940 ... Carpenter Acube® 100, Custom Age 625 Plus®, Custom Age 725®, Free-Cut Invar “36”®, High Permeability “49”®, HyMu “80”®, Invar “36”®, ...There are different grades of 9310. Vac Arc being the highest. More and more bolts are being made from it because of availability. 158 is controlled by Carpenter and you have minimum weight orders to meet or they will not sell to you. Some say 9310 has a slight advantage over 158, but looking at the chemical makeup, they are very similar.Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear.PSA Logoed Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt - 516446450 . Rating: 94%. Regular Price $199.99 Special Price $99.99. Add to Cart. Add to Wish ....

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