Rubber City Armory M16 / AR-15 Bolt Carrier Group - Adjustable Gas Key

Manufactured by Rubber City Armory
SKU: 100-AGK
MPN: 100-AGK
Manufactured by Rubber City Armory
1 Review

In Stock

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The Rubber City Armory 5.56 NATO M16 BCG with Adjustable Gas Key is ideal for shooters who desire less muzzle movement between shots. The bolt carrier group is constructed from high-quality 8620 steel and finished with aerospace nitride coating for optimal durability and strength. The carrier is lighter than the standard M16 carrier resulting in optimal performance and making it ideal for competition. The performance of your weapon is further enhanced with the pre-hardened adjustable gas key with reduced sharp edges due to its radius corners. The adjustable gas key enhances the performance of standard mass GI systems without unnecessary disassembly by simply adjusting the 2 set screws (one to adjust gas flow and one to lock it in place) at the carrier. The enhanced radius machined M16 bolt made of 9310 steel offers years of service life and unrivaled durability making this a competition ready complete bolt carrier group. The Rubber City Armory M16 Bolt Carrier Group with Adjustable Gas Key is ideal for shooter wanting better performance from their firearm.

  • Manufactured by Rubber City Armory
  • 8620 bolt carrier with nitride coating
  • Pre-hardened gas key with nitride finish
  • 9310 steel enhanced radius machined M16 bolt
  • Tool steel extractor
  • Cam pin
  • Lifetime Warranty
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Bolt FinishSalt Bath Nitride
Bolt Material9310 Steel
BrandRubber City Armory
Caliber Gauge5.56 NATO
Carrier FinishSalt Bath Nitride
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
Weight9.3 oz.
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

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These work well. Niche item for pinned barrels.


I've had one of these for a few years. They work as intended, and allow a light buffer for fast cycling with minimal gas. Works reliably and has a lock screw holding in the gas control screw.
<br>It's the only choice if you have a pinned muzzle device on a 14.5” (before braces were invented) or want to keep the pinned gas block (also the case on that same upper).