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CMMG Bolt Carrier Group - Black - 55BA419

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You will receive fast, free shipping for all orders over $35

Shipping cost is $5.50 for orders under $35. We ship with UPS and USPS. 

Most orders ship out within 24 hours

You will receive tracking information immediately at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses.  

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you're dissatisfied with your purchase, in any way, please contact us at - we will do our best to make it right.

Product Options


The CMMG  55BA419 BOLT CARRIER GROUP is a Mil-Spec part made for the M16 in 5.56 caliber. This also works great for the AR-15 in .223/5.56! (M16 bolt carriers are Mil-spec and work with both full-auto and semi-auto rifles, including the M4, AR15, and M16!).

Pick the drop-in replacement and go for the 55BA419 Bolt Carrier Group.



  • Complete BCG. All you need all-in
  • Drop-in replacement - just switch and replace
  • Manganese phosphate finish - protected to last
  • Magnetic particle inspected - quality ensured!



Finish: Manganese phosphate, Black

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