The original entry in the Radial Delayed Blowback series, the CMMG MkG Lower Assembly is perfect for anyone wanting to build a pistol caliber carbine (PCC) that packs the punch of .45 acp without the recoil or weight of traditional blowback operated PCCs. Designed to accept Glock and SGM .45 acp magazines, the MkG lower features an integrated trigger guard, oversized magazine release, flared magwell, and last round bolt hold-open functionality. Available in multiple Cerakote colors, all you need to finish the MkG build is a Stock or Pistol Brace Kit and an AR15 Lower Parts Kit. Swap in a Drop-In Trigger for a more fine-tuned and customized trip to the range.All CMMG products come with their Lifetime Quality Guarantee.**MkG Lowers are designed to work with CMMG .45 ACP Radial Delayed Blowback uppers only. Other manufacturer's uppers may work, but we cannot guarantee function or reliability**