The BOLT Airsoft B4 SR16 BRSS (Blowback and Recoil Shock System) is in stock at Gunfire and here is Lezek to tell you more about it... "B4 SR16 (B.R.S.S.) carbine replica by Taiwanese BOLT Airsoft company is undoubtedly a significant step forward in the evolution of AEG replicas. Due to implemented innovative solutions, it was finally possible to mimic the experience of using a GBBR type replica in a AEG type replica. In short, BOLT Airsoft was able to create an assault rifle replica that truly has a “kick” that it should have. And how it kicks? Check that with Leszek!"