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CMMG Bolt Carrier Group – Black – 55BA419

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90 Day No-Hassle Returns We Pay Return Shipping

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

If you need to request a return, contact us at support@at3tactical.com 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 support@at3tactical.com. 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 support@at3tactical.com – we will do our best to make it right.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

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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