We've combined our newest SSR (Straight-Stepped-Rifling) technology into an incredible two piece barrel design. Muzzle ends are available in several lengths to allow you to change barrel lengths in seconds. The latest in Armson Rifled barrel technology is here now! Spyder SSRs are available with Limited Edition Dust Black Breech (Polished Silver Sold Out) and Fits most JT, PMI Piranha, Viewloader, Brass Eagle models and other Spyder threaded markers as well. Autococker fits WGP Autococker/Sniper in addition to Micromags and any other Autococker threaded marker.