AR15 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT - MELONITE NITRIDE
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If purchasing a BCG with a barreled upper, we recommend the following:
M16 Profile BCG for all Pistol / SBR uppers and 16" barrels with a carbine
gas system. AR15 Profile BCG for 16" barrels with a mid-length gas system,
18", 20" and 24" barrels. These are general recommendations. Please call us
with any questions or concerns before you place your order.
Thank You, MAS Defense.


- Melonite Nitrite Treated
- Bolt: MPI Tested 9310. 7% Stronger than C158.
- Extractor: Precision Machined Hardened Tool Steel
- Gas Rings: Stainless Steel per Mil-Spec
- Carrier: AR15 Profile Carrier 8620
- Gas Key: 4140
- Gas Key Screws: Grade 8 Properly Staked
- Cam Pin: Precision Machined
- Retaining Pin: Precision bent and cut to length
- Firing Pin: 416 Stainless Steel


Melonite Nitriding treatment turns a standard chrome moly steel barrel into a very
lick, hard and corrosion resistant barrel. Unlike chrome lining, the Melonite process
is a treatment done to the surface instead of adding a layer of material. This treatment
is done to both the inside and outside of the barrel. The slick surface will never peel,
is thicker than chrome lining, will not negatively affect accuracy as chrome lining does
and will reduce the amount of friction created. Less friction equals less bore surface
wear which will extend the barrel life. Another added benefit is carbon does not easily
adhere to this surface making your cleaning job that much easier.

This technology has been used by Glock, Springfield and Heckler & Koch for years and is
gaining popularity as more companies are offering their products with this treatment.

  • Item #: AR15BCG-MN
  • Condition: New

AR15 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT - MELONITE NITRIDE

Price: $129.99
Sale Price: $89.99
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