ComGraf's Pump Action Rifle kit consists of the parts you will need to convert a standard semi-automatic AR-15 rifle to a pump action rifle. These include (1) a modified bolt carrier key with attached push rod; (2) turnbuckle nut; (3) full-length Picatinny rail/handgrip guide; (4) modified gas block; (5) aft guide support; and (6) aft guide support cover. The kit requires a rifle-length HBAR format barrel with a 0.75" diameter gas block section supplied by the owner. Custom and carbine designs are possible. Call to discuss.