Custom Shop KWA MK18




The Close Quarter Battle Receiver (CQBR) is a replacement upper receiver for the M4A1 carbine, developed by the US Navy. This shorter barrel makes the weapon significantly more compact, which makes it easier to use in and around vehicles and in tight confined spaces.

Special operations units have largely abandoned the submachine guns that were seen so prominently in the 1980s and ’90s in favor of carbines like the M4. As units increased vehicle operations and combat in urban environments, the need for a weapon with the handling qualities of a submachine gun, but the terminal ballistics of a carbine, led to the development of the Mk18 and the Mk18 Mod 1.

We’ve built our Custom Shop Mk18  on the KWA 2GX platform. It features an all metal receiver with polymer furniture and a aluminum Mk18 handguard.  The 2GX mechbox is one of the strongest on the market, and as such is ready to take high performance upgrades.

As this is a custom product, built in house by our industry leading technicians, please allow a 2-4 week build time.

We recommend an 11.1 lipo battery with our upgrade packages.

Interested in additional accessories or want to custom tailor this gun to your personal style? Shoot us an email at