The Varmint Exterminator Semi-Automatic features a Gas Impingement System, with a capacity of 5 + 1 and ships with one 5 Round Magazine (accepts all std. sizes), manual lever with indicator markings on both sides of receiver, M4A4 Type Flat Top upper receiver with optics riser blocks, and the receiver material is made of forged 7075 T6 aircraft aluminum with aluminum trigger guard. The receiver has a hardcoat black anodize finish. It also features a 20" stainless steel barrel, fluted, matte finish and made from precision 416R Stainless Steel.