Hello, I have inherited Winchester model 25 shotgun, i like the gun very much and I would like to keep it but it has a problem, it was used very much and it would not eject after the shot, i would like to know if can find the whole firing mechanism to replace it. The old one is worn out and it has a gap between the pipe and the firing mechanism and that causes the cartridge to swell....Please help.. Kind regards Hamar Levente