Maybe you will ask me about what is S.R.U , yes they are a new Brand who do some custom work and their frist product will be the SR-18c Stealth & SR-17 Mustang For WE’s G 17. Whatever , you may ask how’s What dose the product look like , working very ?! Ok let’s watch the Video by RA tech, they will bring us a short video with a samll review, Check it now !