Now this is something different from Bunny Workshop. We're so used to them releasing custom airsoft gas blowback rifles based on the AK and its variants that this caught us by surprise. The Bunny Custom AAC M4 Compact Rifle should look good in a CQB game and this is based on the GHK M4 GBB Rifle. It uses the RA-Tech AAC Receiver made for the GHK M4 GBB, the PTS Centurian Arms 9-Inch C4 Rail, a BCM Foregrip, and the MadBull Ferfrans Dummy Concussion Reduction Device.