MasterPiece Arms is expanding on the new model Defender series with a 9mm Luger carbine that uses Glock-pattern magazines. Called the MPA20DMG, this carbine combines a machined aluminum lower with a standard Defender upper in a carbine configuration. The MPA20DMG is built around a 16.2-inch barrel that threaded for common 1/2-28 muzzle devices and comes equipped with a beefy ported compensator. The front is toothed for use as a standoff device. Running down the length of the barrel is a free-floating quad rail for accessories like the Strike Industries angled foregrip shown. The handguard has an inner diameter of 1.57 inches … Continue reading