HM Defense Nitride M16 Bolt Carrier Group with HMB Bolt - AT3 Tactical
HM Defense Nitride M16 Bolt Carrier Group with HMB Bolt - AT3 Tactical
  • HM Defense Nitride M16 Bolt Carrier Group with HMB Bolt - AT3 Tactical

HM Defense Nitride M16 Bolt Carrier Group with HMB Bolt

SKU: HMB-BCG-AR15

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Complete Nitride HMB Bolt Carrier Group

This bolt carrier group goes above and beyond mil-spec, with a key upgrade to prevent broken bolts.  This nitride bolt carrier group from HM Defense features their patented HMB bolt, which has a shorter cam pin and more material than mil-spec.  Basically, the HMB bolt has a socket for the cam pin, rather than a hole.

The HMB bolt has more material for better longterm durability.

A BCG that Lasts

This nitride bolt carrier group makes cleaning easy, and you’ll have peace of mind knowing that the HMB bolt is tougher than any other on the market.  Outside of greater mass to prevent the bolt splitting and a shorter cam pin, everything else in this bolt is the same.  If a part wears, only the bolt itself and the cam pin are proprietary – everything else can be replaced.

Specifications

  • Caliber: .223/5.56, .300 Blackout, .350 Legend
  • Finish type: Black Salt Bath Nitride
  • Carrier Type: M16/Full Auto Cut (Ideal for AR-15)
  • Carrier Material: 8620 Gun Steel
  • Bolt Material: 9310 Steel
  • Cam Pin Material: 4340 Hardened Steel
  • Firing Pin Material: 4140 Steel, Chrome Plated
  • Mil-Spec O-Ring and Gas Rings
  • Weight: 11.5 oz.



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