+1-800-504-5897 Live Chat Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

CMMG describes that this kit is designed to function with their MkG series lowers. Will this kit work in a stock upper/lower? — 3 Answers

by Canidae, from UT, United States Asked on December 19, 2018

Name CMMG, Inc 9mm Barrel and Bolt Carrier Group (BCG) Kit (3.6)
As Low As $437.49 Save Up to $37.46
View Product
Write a Review
Continue As a Guest
Saving...
Sign In or Create an Account (optional)
or Register
Why use an OpticsPlanet.com account for my questions and answers?

Having an account with OpticsPlanet.com makes writing questions and answers even better! We’ll save all of your questions and answers in your account, provide you easy access to them, so you can see how the community has responded.

If you’d like to add a question without creating an account, you can proceed with filling out the fields on this form.

Show
Sort by
Filter by
Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on November 03, 2019

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

13 of 14 found the following answer helpful.
Was it helpful to you? Yes | No
Share
A
Answered by TK, member, from HI, United States, on August 13, 2021

This Cmmg RDB bolt & barrel kit will work with most Mil-Spec uppers & lowers, you will also need the Cmmg 9arc magazines. This Radial-Delayed Blowback system is different from your normal Blowback system, actually 10X better! and you don’t need any dedicated 9mm upper & lower your regular ar15 mil-spec will work just fine. Keep in mind this is a three part system RDB barrel, bcg & mags.

1 of 1 found the following answer helpful.
Was it helpful to you? Yes | No
Share
A
Answered by TK, member, from HI, United States, on August 03, 2021

Cmmg recommends you use a mil-spec upper with a 5.56/223 ejection size port & not a 9mm upper with the smaller size ejection sized port.

1 of 1 found the following answer helpful.
Was it helpful to you? Yes | No
Share