CMMG, Inc 9mm Barrel and Bolt Carrier Group (BCG) Kit

EDEMO CMMG, Inc Barrel and Bolt Carrier Group BCG Kit, 9mm, 8 in, Salt Bath Nitride, Black, 99D517A, EDEMO1

USED CMMG, Inc Barrel and Bolt Carrier Group BCG Kit, 9mm, 8 in, Salt Bath Nitride, Black, 99D517A, EDEMO3

CMMG, Inc MkG Guard 9mm Barrel and Bolt Carrier Group BCG Kit, 16 inch SBN Barrel, Black, 99DE642

EDEMO CMMG, Inc Barrel and Bolt Carrier Group BCG Kit, 9mm, 8 in, Salt Bath Nitride, Black, 99D517A, EDEMO1

CMMG, Inc MkG Guard 9mm Barrel and Bolt Carrier Group Kit, 16 inch SBN Barrel, Black, 99DE642

CMMG, Inc Barrel and Bolt Carrier Group Kit, 9mm, 8 in, Salt Bath Nitride, Black, 99D517A

Government Export Restriction

This item may be regulated for export by the U.S. Department of State or the U.S. Department of Commerce. Please see our Export Policy prior to placing your order.

Government Restriction

By adding to cart, I understand and agree to the Domestic Restricted Product Policy and certify that I will comply with applicable federal, state and local laws and regulations.

Questions & Answers

Will this work in any other 9mm AR style rifle such as a Foxtrot Mike? Expert Answer

No, not without modification. Most 9mm lower receivers have the ejector built into the receiver, as standard Glock and Colt compatible 9mm carriers have no ejector. The CMMG bolt has the ejector built into the bolt (similar to a .223 bolt), so it will not work with a lower that has the ejector.

by Ethan C., Gear Expert, November 3, 2019

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CMMG describes that this kit is designed to function with their MkG series lowers. Will this kit work in a stock upper/lower? Expert Answer

Yes, you can use a milspec upper and lower receiver with this kit.

by Ethan C., Gear Expert, November 3, 2019

View All Q&A You Have a Question? Ask!

Customer Reviews

Helpful Positive Review

CMMG 8" barrel/bolt by Jerbear, Verified Owner, December 9, 2018

If you're looking into buying this, you know what you're looking at. You're attempting to build a PCC with certain characteristics that a direct blowback gun uses heavy buffers & springs to control. Well, it works! It's lighter than your typical blow...
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29/37 found this helpful

Helpful Positive Review

Works Great by Gromit, January 24, 2019

I shoot steel matches and have been using the typical blow back 9mm PCC. Once tuned, they work good as long as you keep them clean and don't mess around with the PF too much. To use the CMMG setup I installed the 9mm CMMG upper on my AR15 lower (st...
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13/22 found this helpful

Helpful Positive Review

Best pistol cal option available by Padden, April 24, 2020

I installed this kit in a mil-spec (recommended by cmmg) upper to use with cmmg’s arc-9 mags. A little over 400 round through it so far in various weights and manufacturers including browning 125 round nose, Winchester white box, and 147 Remington. 1...
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5/6 found this helpful

Helpful Positive Review

My AR9 build by Blue-collar, September 19, 2020

I pick up this CMMG both barrel kit to build my AR9. I pick the 8 inch barrel. High quality, the Bolt and bolt carrier group is perfect. They have a spring behind the bolt and a round cam pin. It’s a little different but other than that it is perfec...
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3/4 found this helpful

Helpful Positive Review

Reliable and Light on Recoil by BB, Verified Owner, September 23, 2020

I built the 8" kit into an Aero Precision Receiver/Handguard, Stealth Recoil Spring, and SB PDW brace. Out of 500 rds, we had one failure to eject, but the round sounded weak when fired, so we weren't surprised. No squip, fortunately. The recoil is l...
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9/10 found this helpful

Helpful Negative Review

Consistent Failure to Eject by Johnson, June 18, 2023

Do not do it. I know what you're thinking "But C3Junkie said this would be the best set up for my AR9" Yep. We all read those posts. Feel free to trust him like I did, after all, I'm just some random reviewer, but let me tell you what is going to ha...
Read More...

6/8 found this helpful

Read All 17 Reviews

Color:: Black
Finish:: Salt Bath Nitride
Fabric/Material:: 4140 Chrome Moly
Caliber:: 9mm Luger
Barrel Length:: 16 in
Gun Model:: CMMG MkG-45 Guard
Barrel Twist Rate:: 1-10
Condition:: Factory DEMO
Included Accessories:: 9mm 16 inch Barrel, Bolt Carrier Group
Firearms Threads Per Inch:: 1/2x28

Code: 2CM-BCG-BBCGK9-99DE642-DEMO

MPN: 99DE642-DEMO

Product No Longer Available

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Product Info for CMMG, Inc 9mm Barrel and Bolt Carrier Group (BCG) 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.

Our MkGs Barrel and Bolt Kits are designed to work exclusively with our MkGs Lowers. Other manufacturers lowers may work, but we cannot guarantee function or reliability. Buy a new 9mm AR barrel today!

Package Contents:

CMMG, Inc MkG Guard 9mm Barrel and Bolt Carrier Group Kit

Ammunition

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Umarex 9MM Blanks, For use with 9mm PAK self loading replica's only, 50 Round Box 2252753

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Freedom Munitions HUSH Subsonic 9mm Luger 147 Grain Round Nose Brass Pistol Ammo, 50 Rounds, FMH9R147N50

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SinterFire Reduced Hazard 9 mm Luger 100 Grain Frangible Brass Cased Pistol Ammo, 50 Rounds, SF9100RHA

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Hornady Custom 9 mm Luger 147 grain eXtreme Terminal Performance Brass Cased Centerfire Pistol Ammo, 25 Rounds, 90282

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Speer Gold Dot Carbine 9mm Luger 135grain Carbine Brass Pistol Ammo, 50 Rounds, 59GDC1

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Speer Gold Dot Handgun Personal Protection 9mm Luger 115 Grain Gold Dot Hollow Point Cavity Brass Pistol Ammo, 50 Rounds, 53614GD

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BarnauL Polycoated Steel Case Rifle Ammo 9mm Luger 115 gr FMJ 1329 fps 500/ct Case, BRN 9mmLuger FMJ115C

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PPU 9mm Luger 0 grain Brass Cased Blank Ammo, 50 Rounds, PPB9L

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Super Vel Ammunition Hush Puppy 9mm Luger 147 grain Full Metal Jacket Brass Cased Pistol Ammunition

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Dickinson LLC 9mm 115gr Full Metal Jacket 50 Per Box/20 Case, BRASS

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PMC Ammunition PMC Bronze 9mm Luger 147 Grain Full Metal Jacket Brass Cased Pistol Ammo, 50 Rounds, Brass, 9H

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STV Scorpio Ammo 7.62x39 124 Grain Full Metal Jacket, Brass Cased Rifle Ammo, 20 Rounds, S762124F

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$0.32/Round

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Super Vel Ammunition 1000 9mm Luger 115 grain Solid Copper Hollow Point Brass Cased Pistol Ammunition

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$1.27 - $1.32/Round

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$0.38 - $0.40/Round

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Freedom Munitions HUSH Subsonic 9mm Luger 165 Grain Round Nose Brass Pistol Ammo, 50 Rounds, FMH9R165N50

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$22.49

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Sellier & Bellot 9mm Luger 140 Grain Subsonic Full Metal Jacket Brass Cased Pistol Ammo, 50 Rounds, SB9SUBA

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Ammo Boxes

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Berrys 53852 401 Ammo Box 9mm Luger,380 ACP 50rd Blue Lid W/Black Bottom

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MTM 50 Round 9MM/380 Green Pistol Ammo Box, P509M10

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BERRYS 30 CAL PLASTIC AMMO CAN, BLACK, 12887

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Gun Parts and Accessories

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