Expo Arms 5.56 NATO Complete MIL-SPEC M16 / AR-15 Bolt Carrier Group - Chrome

Manufactured by Expo Arms
Manufactured by Expo Arms
5 Reviews
$119.96 $149.95

In Stock

Standard orders will ship out 2 business days if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



The Expo Arms Bolt Carrier Group is a great choice for any build. This drop-in AR-15 BCG features a corrosion resistant hard chrome 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 chrome 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 FinishChrome
Bolt MaterialCarpenter 158 Steel
BrandExpo Arms
Caliber Gauge5.56 NATO
Carrier FinishChrome
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 www.p65warnings.ca.gov

Ratings & Reviews

5 reviews

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

Excellent Purchase

by -

Purchased the Expo Arms 5.56 Mil Spec Chrome BCG about 10 days ago. Was out at the range today to do my normal "keep up the skills" shooting regimen. Took out 5 mags ( 30 per) and fired off all 150 rounds. There wasn't one jam, fail to fire or fail to feed. The BCG worked flawlessly! Another benefit that I didn't think about was cleaning. With a chrome BCG, you don't have to wonder if you've already cleaned a certain part or where to put your attention. The Expo 5.56 Mil Spec BCG has made a VERY good first impression. Glad I purchased this item from Primary Arms. They HAD the BEST deal on this BCG.

Great Price and Excellent BCG

by -

EXPO ARMS 5.56 NATO COMPLETE MIL-SPEC M16 BOLT CARRIER GROUP - CHROME is an excellent BCG. Can only vouch for initial quality and functionality. Dropped in my Stag 15 Tactical and this BCG ran flawlessly. NO FTF, NO FTE and responded very well on a rapid-fire exercise. Will review again after 1,000 rounds. Have run 150 (5 Mags) without a hitch.

Cleans easy; runs flawlessly


I love this BCG. it has run flawlessly and cleans up easier than the nickel boron BCG ‘s that I have in two other rifles.


by -

Have a Stag 15 Tactical and wanted a BCG as a spare. When it arrived, went to the range and put 3 mags through it ( 90 rds) Have now run about 500 rds and NOT one FTF or FTE. Runs great. Have cleaned it up and placed my factory BCG back in the rifle. It's good to know that if I need to switch, it won't skip a beat. Great job, Expo Arms!


by -

Good stake job and a quality part from a quality company!