The M4-22 PRO Pistol is a premium .22 caliber semi-automatic AR styled pistol with aluminum upper and lower receivers and all the features of a true M4 pistol. The PRO Pistol features the T5 Armbrace, 11 inch barrel, 9" composite M-Lok handguard and weighs only 4.1 lbs. - CALIBER .22LR - MAGAZINE (1) 25rd capacity - BARREL 11" 4150 Solid Steel Barrel with Parkerized Finish - HANDGUARD 9" Composite M-LOK - BRACE T5 Armbrace