Toolcraft probably makes more BCGs than any other manufacturer in the USA, and they are excellent quality. The company's components are so reliable that many of the big USA gun brands will not bother making their own BCG, they simply order them from Toolcraft. M16 extreme duty-ready complete bolt and carrier assembly with firing pin. Because this is an M16-ready bolt carrier group, the carrier is heavier than a typical semi auto AR-15 carrier due to additional material in the back end which results in better firing rhythm. The gas key is nicely staked. This is a very top shelf product. The bolt is made from 9310 steel, a more modern tool steel compared to the classic carpenter steel. It is a nickel-chrome-molybdenum case-hardening steel, with good strength and toughness properties. It has high hardenability, high core hardness and high fatigue strength. 9310 steel is typically used in components with large cross sections requiring high toughness and core strength such as gears, crankshafts and heavy-duty gear shafts in aircraft and truck construction. 5.56 Bolt Ready to drop in and go Mil-spec Phosphate finish Chrome-lined bolt carrier Chrome-lined gas key MPI inspected (and laser marked) bolt Made in USA Weight: 327g You get: (1) Assembled bolt carrier group (BCG), ready to drop in Compatible with: All AR15/M16 upper variants that use a 223/5.56 case base: .17 Remington .17/223 .20 Tactical .20 Practical .20 Vartag .204 Ruger .221 Fireball .222 Remington .222 Reming
Brand Name : Toolcraft
Distributor : Truenortharms.com
Distributor Product ID: 6120
Distributor SKU: 688759046531-repl
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