NeW problem with Winchester 120, locks up with shell in chamber

[demented]

 Won't eject, tore it down found a small 1/4" X 2" spring crushed behind the bolt.  Seems there is a hole in the rear of the receiver this might go into but I can't see what is supposed to hold it in place, what purpose it serves.  Thanks for any help with this..
EDITED TO ADD:  This shotgun had been painted so I tore it all the way down to clean it thoroughly (removed and tore down bolt)  I think?  I got it back together as it was, have no idea if this problem existed before I tore it apart.   Gun pumps like butter when empty, lock releases both when fired and manually, all seems as it should.....until chambering a shell, then the bolt locks up so bad the only way to unload is to remove the barrel.  I'm new to this design, troubleshooting is difficult without knowing whats supossed to be happening

[Goatwhiskers]

Same as a 1200.  Try e-gunparts (Numrich).  Goatwhiskers

[gunnut69]

Below I'll insert a parts blow up. It's a 1200 but is the same..  You might check the bolt again. Sounds like something is jamming the rotation of the bolt head or not allowing it to completely lock closed.. Check the disconnector for function and that it is there.. Also the only spring that I see fitting your description is the firing pin spring? The spring parts loose in the action is a bad sign. Perhaps the disrgam will help. I've not seen this problem before..


http://stevespages.com/ipb-winchester-1200.html