I just bought a romanian wasr-10 ak. The gun has a tapco trigger and piston. The rifle looks great, no rust or anything. When I let the bolt carrier down gently the action hangs. Upon close inspection I noticed that the bolt is rubbing the hammer as it goes by putting the gas rod in a bind as it goes into the gas tube. Also it extractor seams to have a problem riding over the rim of the case. The weapon fires fine and the action closes fine if let go fast. Is this a problem or normal? What can I do to fix it? Thanks in advance for your input.