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I got the FTK for my M4. I installed it in my ICS and so far I have been happy with it. I thought the quality was excellent, especially for the price. The piston head and spring guide have a bearing so everything has really good movement. The cylinder head has a ring of material to help lessen the force of the piston head striking against the cylinder head. While a systema silent piston/cylinder head are better-they cost almost has much as the FTK. I ended up trying different configurations and finally used my stock cylinder and air nozzle (the Hurricane did not fit on my tappet plate well??) because they provided a better air seal. I have not cronied my gun but I would estimate it is shooting around 350 fps with 0.25’s (will punch through both sides of a pop can). I bought the kit from 204Tactical and I found their price (75) to be the lowest and shipping was fast and easy (2 days to Alberta). I would recommend the kit to anyone who does not want to spend a fortune on a systema.
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