glivdub03

Hoping I could get some answers/help on my ar15 that I built a year ago and still cant get it to shoot without a malfunction. So here is the list of parts i used for the build. Spikes lower with daniels defense parts kit. R guns upper chamber 5.56 16 inch barrell bushmaster stock with carbine buffer spring and heavy buffer mags that i use are p mags 10rd ammo xm193 62g and 55g 5.56 The lower was put together by a close friend who has done several ar builds. The upper was already assembled when i bought it. I lubed the gun with a good amount of m-pro 7 oil and was ready for the range! The issue i am having is when you fire the first round it ejects but when it trys to pick up a second round the bolt comes forward, the face of the bolt catches the case at the neck and while the bullet is in the feed ramp.So what happens the case is crushed at the neck.To clear it i have to drop the mag and pull back the charging handle give it a smack and it falls out.I had the gun inspected at a local gun shop and feed ramps smoothed out. The gun shop i brought it to checked the gas system, cleaned and oiled it, smoothed the feedramps, inspected the lower along with other parts. They said the lower was put together correctly and to go test fire it to see if the issue is solved. It is still doing the same thing and i dont know what to do. Any help would be very appreciated.. Thanks