The sig mpx redefined modern pistol caliber sbrs, and this air rifle version does no less for co2 rifles.Matched to original model weight, balance, and controls, the sig mpx air rifle puts more accurate performance into more accessible practice.Chambered in.177 pellet, features include an 8" rifled steel barrel, synthetic handguard, picatinny rail, tactical front grip, flip-up front, and rear sights.Caliber: 177