The Desert Tech MDR 12-inch SBR-length configuration uses the bullpup layout to achieve a total length comparable to a pistol-caliber carbine while chambering the full-power 5.56x45mm cartridge. Type: Bullpup Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2018, USA Weight: 7.8 oz Overall length: 23" Status: Active Intended use: Home Defense, Tactical