Quote History Quoted:
I know from personal experience Toolcraft .458 S bolts are absolute crap. Rather than take a chance on an unknown product of dubious pedigree I’d buy either a bolt or complete BCG from TROMIX. Then you know you are getting quality and that it will work if the BE on the barrel is any good.
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AR15part.com says their bolt is special, not ToolCraft.
458 SOCOM Bolt Carrier Group Premium Nitride BCG
This is a specially designed 458 Socom bolt carrier group developed by us for use with 458 Socom upper assemblies. It is highly recommended to use our bolt with 458 Socom uppers/barrels to eliminate feeding and extraction issues that are common to 458 Socom's that do not use this bolt. Our 458 Socom bolt assembly has MANY specific, unique and purposeful features about it that other brand 458 Socom bolts do not have. These features are absolutely critical for reliable, consistent performance in 458 Socom uppers.
Bolt carrier group (full auto version) for your AR15, M16, or M4. Nitride Salt Bath treated on exterior and interior carrier. This M16/M4 carrier includes the properly staked Nitiride treated gas key. Gas key is heat treated per USGI specifications. Gas key is secured to carrier via USGI domestic mfg Grade 8 fasteners and properly staked per Mil-Specs. These properly hardened parts insure a strong staking and proper gas system functioning.
The bolt assembly is machined from Carpenter 158 steel for increased strength, includes tool steel machined extractor and ejector, and extractor spring.