Hi, new member, longtime Sub2000 owner. I was plinking at the range today, shooting some crappy leftover Perfecta ball ammo. After a few rounds I noticed my sub2k refused to go into battery. Thinking it was a simple malfunction or stuck case, I reracked the bolt to try to chamber another round. Same problem again and again with each round. When I looked at the last spent casing, I noticed it was very slightly mushroomed. Also, trying to rack my memory, I *think* the final round felt a little hotter than the ones before? By the same token, I really, really REALLY dissuade anyone here from using Perfecta. Rounds would randomly hit four inches off paper in every direction imaginable at only 25 yards. If it was indeed an overpressurized round, can't say I'd be surprised. In hindsight I probably should have stopped shooting after seeing just how haphazard the accuracy was. Anyway, with a visual inspection I notice what could be some damage to the face of the hinge where it connects with the barrel/chamber? The barrel seems to be ok looking through it, but I suspect the chamber may have taken some structural damage and is no longer within spec to hold the round . Luckily the bolt head seems to be ok, and the trigger and action are all functional. I've provided some photos to give a better look: http://imgur.com/a/bszXs I don't want to go through the hassle of sending my sub2k in to Keltec -- I'm already in mourning that it's out of commission for the first time ever in its 18 months of life. My question is, do you guys think it's likely damage to the hinge, the chamber/barrel, or all of the above? Or perhaps something else entirely? Would it be worth it to see if the warranty would cover Keltec sending me a replacement hinge? EDIT - posted this in a response after fiddling with the rifle some more: After cleaning and lubing the rifle thoroughly and racking a few snap caps into it, it seems to be going into battery now. Rounds are extracting fine as well. However, I'm a little concerned still as it seems that perhaps the barrel liner/rifling shifted backwards towards the chamber, and that was what was causing the rounds to hang up as the case ridge was hitting it prematurely. I suspect that it effectively shortened the length of the chamber, perhaps. (compare the liner in the first set of images/how the round sits in the chamber with this second set) http://imgur.com/a/VMjUI I think hammering home rounds and adding a little lubrication help shifted the barrel liner back into position. I guess the question is, is this gun still safe to shoot now? I don't want my barrel liner blowing out the end of the muzzle next time I take my sub2k to the range. I can't find anywhere online of this happening to another sub2k owner, though. I will admit the gun was fairly dirty during my range session, but not absurdly so. Maybe 350+ rounds worth of buildup since the last cleaning. Most of that was white box, which obviously can be quite filthy. Perhaps a dirty chamber and the blast of a slightly overpressurized round caused the barrel liner to shift? The barrel itself feels sturdy and nothing appears loose or out of whack, either. I have a business acquaintance that works at a local indoor range complete with an on-site gunsmith who owes me a favor. Might go cash it in and ask if the gunsmith can take a look at it just in case. Still not totally confident to shoot it again.