I'm somewhat amazed and concerned here. You paid good money (I assume) for a very specialized job of affixing a barrel to your receiver in order to actually use it. The job should have been done without problems, checked for proper functioning and sent to you to use. You should not have to spin your wheels and get numerous opinions, albeit good advice at times, to figure out what is going on.

Another point is, if you fool with it and can't fix it properly and then send it back, you may void any warranty to have it fixed by the gun smith.

Save time, worry and trouble and send it back! It needs to be 100% before using it or you may endanger yourself and others!

I would have already had it back to the guy to be fixed by now.

Please be careful and send it back!