Escort BullTac 20 Gauge Semi-Auto 3" 5+1 18" Black Steel Barrel, Black Picatinny Rail Aluminum/Polymer Receiver, Bullpup w/Pistol Grip Synthetic Stock The Escort BullTac semi-auto shotgun is a sporting, security and law enforcement companion. The purpose-built bullpup shotgun features an 18" barrel for shot or slugs; synthetic stock; side accessory rails on the carry handle; Picatinny optics rail; detachable carry handle; adjustable rear sight, fixed front sight; QD sling mount; Fixed cylinder choke and manual cross button safety.