SSR4 MK1 GEN2 POLYMERThe SSR4 combines everything youll need from the very beginning of your airsoft journey until the advanced stages. It is the universal tool for whatever airsoft throws at you! Woodland or CQB, you can easily shine in all those situations thanks to durable, high performance internals and modular externals. SSR4 Mk1 Features: Programmable Electronic Trigger Unit (includes burst, binary, pre cocking, battery protection, etc.) 22 rounds per second with