Evike.com carry the BOLT B.R.S.S AEG Series at their online store. BRSS means the Bolt Recoil Shock System which is a simulated blowback and recoil system for AEGs... "Bolt Airsoft excels in bringing realism to the Electric Airsoft rifle market through their patent pending Bolt Recoil Shock System (B.R.S.S. for short.) Their goal is to combine the advantages AEGs have such as performance, consistency, and reliability with the often sought after recoil impulse from a gas blowback system.