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CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit Up to $34.96 Off w/ Free S&H — 2 models

CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 16 inch SBN Barrel, Black, 45D855E
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
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CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 16 inch SBN Barrel, Black, 45D855E
2 of 6 images
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 16 inch SBN Barrel, Black, 45D855E
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
3 of 6 images
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
4 of 6 images
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
5 of 6 images
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30
6 of 6 images
CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit, 8 inch SBN Barrel, Black, 45DBF30

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Questions & Answers
Will the New Frontier C45 lower work with the CMMG radial delay blowback bolt carrier group and 16" barrel. Expert Answer

No, these only work with the CMMG MkG Lowers due to the ejector being built into the bolt face.

by Ethan C., Gear Expert, September 24, 2019
See 4 More Answers
Will an angstadt upper and lower work with this Expert Answer

No, these only work with the CMMG MkG Lowers due to the ejector being built into the bolt face.

by Ethan C., Gear Expert, September 24, 2019
View All Q&A You Have a Question? Ask!
Customer Reviews
Most Recent Reviews
Fun Lil .45 by Shane, Verified Owner, December 11, 2025
Just got back from the range, shooting this for about the 10th time, and love it! My first ground up build (no complete upper), and I'm super happy with it! You may have to play with buffer weight, I'm now using a 5.6 oz., but it functioned pretty we...
Read More...
Read 1 Review
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Product Info for CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit

Our MkG GUARD Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using our Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. This results in a lighter BCG for a lighter rifle, and less felt recoil than a straight blowback system.image

While the CMMG GUARD 45 was design for .45 ACP , we have tested it, and are proud to say that it is safety rated to fire 450 SMC.

Our MkG Barrel and Bolt Kits are designed to work exclusively with our MkG Lowers. Other manufacturers lowers may work, but we cannot guarantee function or reliability.

Specifications for CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit:

Manufacturer: CMMG
Color: Black
Finish: Salt Bath Nitride
Fabric/Material: 4140 Chrome Moly
Caliber: .45 ACP
Barrel Twist Rate: 1-16
Gun Model: CMMG MkG-45 Guard
Included Accessories: Bolt Carrier Group
Condition: New

Package Contents:

  • CMMG, Inc MkG Guard .45 ACP Barrel and Bolt Carrier Group Kit

What firearm models does the manufacturer say CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit is compatible with?

The manufacturer suggests that CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit is compatible with CMMG MkG-45 Guard

CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit Orderable Models

List of Orderable Models

  • CMMG, Inc Barrel and Bolt Carrier Group Kit, .45ACP, 8 in, Salt Bath Nitride, Black, 45DBF30 , MPN: 45DBF30 , UPC: 815835019765 , Code: 2CM-ATB-BBCGK45-45DBF30
  • CMMG, Inc Barrel and Bolt Carrier Group Kit, .45ACP, 16 in, Salt Bath Nitride, Black, 45D855E , MPN: 45D855E , UPC: 815835019789 , Code: 2CM-ATB-BBCGK45-45D855E

CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit Unavailable & Discontinued Models

List of Unorderable Models

  • USED, CMMG, Inc Barrel and Bolt Carrier Group Kit, .45ACP, 8 in, Salt Bath Nitride, Black, 45DBF30 , MPN: 45DBF30-EDEMO , Code: 2CM-ATB-BBCGK45-45DBF30-EDEMO-SC-D
  • DEMO, CMMG, Inc Barrel and Bolt Carrier Group Kit, .45ACP, 16 in, Salt Bath Nitride, Black, 45D855E , MPN: 45D855E-DEMO , Code: 2CM-ATB-BBCGK45-45D855E-DEMO
  • USED CMMG, Inc Barrel and Bolt Carrier Group Kit, .45ACP, 16 in, Salt Bath Nitride, Black, 45D855E, EDEMO1, Used, Condition Fair, Installed/Mounted , MPN: 45D855E-EDEMO1 , Code: 2CM-ATB-BBCGK45-45D855E-EDEMO-IN-D
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Last updated 2026-09-18 UTC.