The Action Army AAP-01 "Assassin Pistol" is a cool designed pistol that is very similar to the Ruger MK4. The pistol is green gas powered and features a fair amount felt recoil as well as snappy cycling. The AAP-01 also comes with a threaded outer barrel for the mounting of suppressors. We carry a full line of custom parts and accessories to upgrade or make your AAP-01 the custom pistol of your dreams