READ FULLY! I just want to buy or get help with a hpa tippmann upper that is stock, NO FULL GUNS. In other words, I don’t want your gun, only the top receiver. The holes for the rear pin to go through got messed up (probably due to me forcing the pin though, idk) and it raises it slightly when there is air in the gun, so the sear sometimes does not catch properly or it won’t fire. AN O F F E R, T R A D E OR HELP WOULD BE NICE.