If you have the issue, you’ll know it. Bolt will stick on close. Mine is also new. 3500’s as well. This is my first rimfire build so I thought there was some kind of break in period, until it kept happening. Other than that, it has fed and shot flawless so far. Had 4 lots of Tenex yesterday and all shot extremely well thru the PVA barrel. Finally settled on the lot that shot best at 100.