Give your M4 gas blowback rifle even more recoil than it comes with as standard! Simple to install and fairly cheap. Suitable for WE, WA, INO & KSC/KWA series rifles.
Buffer comes with a set of washers so that the recoil distance can be adjusted. To fit, install 3 washers in the stock tube and try to cycle by hand. If the bolt catch does not work then remove a washer, if the bolt can go more than 3mm rear of the bolt catch then add a washer. Please ensure that you are happy with your set up by manually cycling the weapon before actual use Current sets have silver washers not black.