The UDP-9 Pistol is a compact AR-9 style firearm chambered in 9mm and fed with GLOCK(R) magazines. It features last round bolt hold open, an integrated trigger guard, flared magwell and a 5.5″ free float M-LOK hand guard with a modern, ergonomic, 7 side design. Machined from 7075-T6 aluminum. Includes one GLOCK(R) OEM 9mm magazine. UDP-9 Specifications Accepts Glock(R) 9mm double stack magazines Last round bolt hold open on empty magazine Flared Magwell for Faster Reloads Integrated, Oversized Trigger Guard 5.5″ Free Float M-LOK Handguard Made from 7075-T6 Aluminum.