CRW介紹Viper Tech Sr16 URX 18mm Bolt upgraded SR16Mk12 rail Orginial 16mm bolt

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=LOZFgpUlMTE

SR16 URX is using 18mm Nozzle and Bolt nickle plated, so the recoil is stronger and louder than mk12.SR16 Mk12 is only original 16mm Nozzle and Bolt.

Viper tech SR16, Viper tech mk12, Viper tech gbb
#############################