Selling a modified S&T M4 Maddog 7075 aluminum reciever set Radian charging handle Anti reversal fire control pins Drop in rail (I tried a URGI rail on this and it's a pain to get to the hop up without a delta ring) Mission first tactical pistol grip Metal hop up unit Strike Industries buffer with custom weights 150% recoil spring Shoots around 325-350fps Asking $200obo +20 shipping pp gs