--WILLING TO NEGOTIATE-- Got this back in December and a new hpa system for my M4. Sadly I can't use this due to my local field rules so it practically new. Capable of turning back into GBB if you get the values on evike. 500fps (out the box) 3x mags ---> $60 brand new Flip Magnifier Reddot Optical rail mount ---> AK style Hpa taps x3