Next Level Armament NLX Forged 9mm Upper Conversion Kit (8 in)

Next Level Armament's NLX Forged 9mm Upper Conversion Kit turns a standard AR-15 lower into a 9mm carbine without a magazine well block, Glock-pattern magazines, or a fixed ejector. The upper uses a radial delayed blowback system with a bolt carrier group that resembles a standard AR-15 BCG, and the kit includes one 33-round CMMG AR15 9mm conversion magazine that drops into the normal AR-15 magazine well and holds the bolt open on empty.

Next Level builds this version on its NLA 15 forged upper receiver, which it says works with any mil-spec AR-15 lower, including those with large or extended aftermarket bolt catches that can conflict with the billet Horus kit. This configuration has a 8-inch barrel. Because the system depends on the AR-15 style bolt and the CMMG magazine, it will not run on a dedicated AR9 lower that uses a fixed ejector and a one-piece flat-face blowback bolt. It suits training on an AR-15 lower with cheaper 9mm ammunition.