I sent him a brand new transferable receiver to build up completely. When it arrived it would only fire short bursts with the 18" barrel and wont fire at all with the 9" barrel. I get light to no strikes on the casings. We have spent several conversations trying to figure out with no answer. It is clean, the barrel locks up, feed ramp down. It wont even fire if I insert a round directly in the barrel and try to fire. Same goes if I try from drum or feed block. Very frustrating after $4000 & 2 month wait.