The 5.7x28mm cartridge was designed to provide rifle caliber-like ballistics with less recoil than most pistol caliber carbines. If you like the modularity potential of the AR15 platform you're in luck, this BANSHEE is built on our Mk4 AR15 platform which uses a standard AR15 lower receiver and our new and improved 5.7x28mm AR conversion mags, which means no need for a proprietary lower. Features EML handguards, full length M-LOK slots on both sides and the bottom of the handguard as well as M-LOK between the top picatinny rail sections; ZEROED parts including: pistol grip, drop-in trigger, 60/90 degree ambi safety, linear compensator 5.56mm, ambi mag catch, extended mag release button, AR15- ambi charging handle, bolt catch and polymer dust cover. Includes CMMG 32rd magazine.