My father has a Savage (don't know model right now), 223/20 gauge over/under rifle. The problem is that when you shoot 20 gauge, everything is ok but when you fire 223 barrel, after the shot, the barrel will open just like you unlatched it. Doesn't come flying open but you can pull it open without "unlatching it". Does that make any sense what I am saying? Anybody got any ideas, or do you think Savage would warranty this. The gun is sveral years old. Thanks