Cross Machine Tool M16 Complete Bolt Carrier Group - Nitride

Manufactured by Cross Machine Tool
Manufactured by Cross Machine Tool
4 Reviews

In Stock

Standard orders will ship out 1 business day 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.

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The Cross Machine Tool Co. complete bolt carrier group is a high quality upgrade for your next build. The carrier is machined from tough 8620 steel with a full mass M16/full auto for optimal reliability and strength. The 9310 steel bolt assembly is magnetic particle inspected. The complete assembly is ready to drop in to your favorite .223 Rem, .223 Wylde, 5.56 NATO, or 300 BLK build!

  • 5.56 NATO / 300 BLK
  • M16-cut 8620 Carrier
  • 9310 Bolt Assembly
  • Magnetic Particle Inspected
  • Properly staked gas key
  • Salt bath nitride finish
  • Made in the U.S.A.

Cross Machine Tool Co., utilizing the latest machining technologies, offers high quality products that you’ll be excited to own. Cross Machine Tool is a veteran owned business that takes pride in manufacturing products you will own. CMT products exceed military standards, so you can build the best AR style rifle possible.
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Bolt FinishSalt Bath Nitride
Bolt Material9310 Steel
BrandCross Machine Tool
Caliber Gauge5.56 NATO
Carrier FinishSalt Bath Nitride
Carrier Material8620 Carpenter Steel
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

Ratings & Reviews

4 reviews

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by -

Fantastic BCG. The black nitride makes it super easy to clean and eases into the chamber. Had a few buddies that have built multiple ARs and had amazing things to say about Cross Machine and glad to say that I’m happy I listened to them

A solid performer

by -

Only ~100 rounds through this so far, but it has been flawless in performance and no hiccups. Would recommend fully.

Nice BCG

by -

Excellent craftsmanship from CMT. Shipped in a protective case. Arrived within a week of placing the order. Haven’t had time to complete the build so no review on performance yet.



I have built many ARs and use a wide variety of BCGs from the cheapest to $250+. I know this is hard to believe but this is easily the best running BCG I have. With about 2k rounds fired on different builds I haven’t had one F2F or issues whatsoever.
<br>These are extremely well built and run incredibly. Look no further