First off I want to say that it's always best to buy from Pyramyd Air, Air Gun Depot, Midway USA or some other vendors with great return policies. I tune Hatsan's ( probably because I am crazy LOL) but they can be good accurate guns . There's a check list I go through for any gun that is bought before its shot. I break it open but don't cock it, and clean the barrel with just white paper towels no cleaning solutions. Push them through until it comes through clean. Next you want to do a pellet to bore test , this is very critical for me. ( Mike Ellingsworth has a YouTube video on this) If it passes this test ( which I have had HW's fail this test and later through shooting it prove to me at 10 yards the barrel was bad) then I look at the breech seal and make sure ( with cheaters ,I hate getting old) that it's sticking up about 2 to 4 thousands? Look at it very closely because I have found a few of them NOT machined correctly. I have sent guns back to Pyramyd Air that have failed just these 2 tests with no problem or questions and received an other new one within a few days. There are several other things that I check but usually these are the main ones. If I can help anybody here with Hatsan problems shoot me an email. I have no ties to Hatsan , it's just I have been there with several of there problems ( PCP's and springer's) and I fixed it myself. I have rebuild my gas rams and they have held up very well. ( at least 5 years now) I hope this small amount of information helps?
