Description

Manufactured by the finest Mil-Spec contractor, these are the best AR rifle bolts we have found. This is the parkerized version of the same bolt carrier group inside every Wilson Combat Custom Rifle.

Parkerized exterior and chrome lined internally, the full-auto carrier includes the proper Mil-Spec gas key that is chrome lined and heat treated per GI specifications. The gas key is secured to the carrier via USGI domestic mfg Grade 8 fasteners and properly staked per Mil-Specs. These properly hardened parts ensure proper gas system functioning.

The bolt assembly is machined from Carpenter No. 9310 steel, shot peened for increased strength and a includes tool steel machined extractor and ejector, appropriate extractor spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).

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Comments (4)

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Carpenter 158 is now mil-spec standard. The chemical composition of Carpenter 158 is different than 9310. 9310 doesn't have any chromium content and needs to be heat treated properly to get to appropriate hardness. When these 9310 bolts first came out there were some problems which are well documented on AR15.com. There are some who say that 9310 properly heat treated is about 8% harder than 158. But there is no mention of its modulus of elasticity in comparison, brittleness or other properties. Not trying to trash the bolts. If Wilson Combat uses them they probably last a long time. Just trying to point out that these aren't mil-spec and that matters to some eople

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And for years they used milspec 8620. 158 does not mean the others will fail.

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This is a Carpenter 9310 Bolt not Carpenter 158?

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Using pharmaceutical terms: Carpenter 158 is the brand, 9310 steel is a generic

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