I have a J P Sauer 20 that I am having issues with. The firing pins do not retract after shooting evidently. It would not break open after the shot and I only noticed this when I saw that the hole where the firing pins come through the breach are getting some distortion in their shape. Is it a fairly simple job to dismantle the action on these shotguns to see if it is gummed up and just in need of a good cleaning and lubrication?