The Bull 20 has a 416 stainless steel bull barrel, 6 grooves, right hand 1X9 twist, button rifled, gas operated rotating bolt, and a 8620 steel bolt carrier, no sights. The upper receiver features A3 flattop, dust cover, and shell deflector. The Upper and Lower Receiver are made of 7075-T6 aircraft aluminum. The Lower Receiver feature a semi-auto trigger group, aluminum trigger guard and aluminum magazine release button. The stock is a standard A2 black Zytel with trap door assembly. The handguards are aluminum ribbed with free float tube.