Expo Arms 5.56 NATO Complete MIL-SPEC M16 Bolt Carrier Group - Phosphate

Manufactured by Expo Arms
Manufactured by Expo Arms
5 Reviews

Out of Stock

NOTE: Limit 3 per household. Quantities exceeding 3 will not allow checkout.



The Expo Arms Bolt Carrier Group is a great choice for any build. This drop-in AR-15 BCG features a tough manganese phosphate finish, MIL-SPEC dimensions, and a magnetic particle inspected carpenter 158 steel bolt. Crafted from domestically sourced 8620 steel, the M16 cut carrier includes a gas key fastened by properly staked grade 8 screws. Made in the U.S.A. and covered by a lifetime warranty, you can count on this BCG for a lifetime of service.

  • .233/5.56 NATO
  • Hard chromed bore and gas key
  • Manganese Phosphate finish
  • M16 cut
  • Aircraft quality 8620 steel carrier
  • 4130 steel gas key
  • Properly staked grade 8 gas key screws
  • Carpenter 158 steel bolt
  • 4140 steel extractor
  • MIL-SPEC O-ring
  • MIL-SPEC gas rings
  • 4140 steel cam pin
  • 8740 steel firing pin with hard chrome finish
  • Magnetic particle inspected
  • Lifetime warranty
  • Proudly made in the U.S.A.
See More


Bolt FinishManganese Phosphate
Bolt MaterialCarpenter 158 Steel
BrandExpo Arms
Caliber Gauge5.56 NATO
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 www.p65warnings.ca.gov

Ratings & Reviews

5 reviews

  • 4 stars
  • 0 reviews
  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

4K Rounds and counting.

by -

Waited to review this item. Arrived quick within a weeks period. One it came in I decided to right away change the extractor spring and o-ring to the BCM enhanced set. Outside of all that she’s been down 3k of steel and 1k of brass. So far no signs of wear on it.

Great premium BCG

by -

This appears to be a very high quality BCG made from the premier manufacturer in the industry. I bought a new Colt 6920 SOCOM late last year, and the BCG that came with it didn't have a "C" or "MPC" on it. But it did look EXACTLY like this one from EXPO. Both also have aggressive gas key staking. I believe they are made by the same company. Meaning it's right there with BCM and SOLGW BCG's.

good to go

by -

Very nice finish, machining and construction. All the interior bore surfaces are extremely smooth. Cycled brass and steel case ammo just fine. Nice ejection pattern. All components are wearing in nicely. I am very pleased

Tier 1 BCG


Awesome BCG. It seems as it is the same quality as some tier 1 BCGs in the game. Wouldn't hesitate to buy another one.

I dig it.


Good specs, looks good, works well, no problems.