CMMG MK9 9mm Stripped AR-15 Lower Receiver
- Forged 7076-T6 Aluminum
- Includes feed ramps, ejector, and extended bolt catch
- 9mm caliber
- Accepts standard 9mm colt pattern mags
California Prop 65 warning
WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.
Ratings & Reviews
Simply The Best!
by Jayborulez -
Built a 9mm rifle using this lower. After getting the tuning right with different buffer/spring combos, this gun is one of my favorites. If you want a Colt-style 9mm, this lower is the way to go. Why buy one of the adapters and a lower when you can have a quality dedicated lower? It's expensive, but you get what you pay for. I used the CMMG bolt, JP tuned and polished spring, and Spike's T3 buffer and it runs 115, 124, and 147 grain ammo 100%.
Ejector needed adjustment
by CR -
Put this lower together with a Right to Bear upper and BCG, a Bear Creek 7.5” barrel, and used ASC mags. First shots had FTE issues. Hand cycling rounds barely ejected from the gun it at all. Noticed the ejector had brass on the inside (was skimming the casings instead of hitting the rim). Bent it slightly until it was noticeably pointing inward. Fired 100 rounds without further issue. -1 Star for not working out of the box. It’s an easy fix and in all truth, it could have been differences in tolerances from mixed parts.