CMC Triggers Enhanced Nitrided AR-15 BCG - 5.56

Manufactured by CMC Triggers
SKU: 81631
MPN: 81631
Manufactured by CMC Triggers
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The CMC Triggers Enhanced AR-15 Bolt Carrier Group has been expertly designed to increase the life and reliability of your AR rifle. It features a new geometry that reduces the amount of friction points against the upper receiver reducing wear and making the action feel smoother. It is also finish in a salt bath Nitride finish which further increases lubricity and hardness, so you can go longer between cleaning. However, it still has Mil-Spec dimensions for compatibility in all AR-15 upper receivers. It features an M16 cut with a flared end that increases weight for use with SBRs or suppressed rifles while also decreasing the amount of carrier tilt. Every surface is CNC ground after the heat-treating process to ensure precise dimensions with the highest possible tolerances. The carrier is machined from 8620 steel while the bolt is machined from 9310. The bolt is shot peened to increase strength and then high pressure tested to ensure a long service life. If you plan on running suppressed or simply want to build a bomb-proof rifle, the CMC Enhanced AR-15 BCG is the way to go.

  • Black Nitride finish
  • Enlarged forward ports
  • Optimized for suppressor use
  • Hardened 4340 cam pin
  • Mil-Spec 8740 steel firing pin
  • MPI and HPT tested
  • Mil-Spec Extractor Spring & O-Ring
  • .223/5.56/300BLK compatible

With roots in aerospace manufacturing, CMC is perhaps best known as the producer of the original drop-in precision trigger for the AR-15/10 platform. CMC Triggers are dedicated to crafting the finest parts and accessories for law enforcement, military, and civilian use.
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Bolt FinishSalt Bath Nitride
Bolt Material9310 Steel
BrandCMC Triggers
Caliber Gauge5.56 NATO / .300 BLK
Carrier FinishSalt Bath Nitride
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedHigh Pressure Tested
Magnetic Particle InspectMagnetic Particle Inspected

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

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