I had a couple of issues. When doing the initial cleaning, I noticed part of the front sight bead protruded into the barrel about 2mm. A little cleanup with the Dremel fixed that. The other issue was the bolt that holds the stock to the receiver came loose after only 5 rounds (#7.5 birdshot). Took it apart and replaced 2 of the 4 washers with a lock washer and put some blue Loc-Tite on the threads. I've put probably 50 more rounds through it after that with no problems.