Ok Ill try this again, had typed out all this then lost it before I could hit the submit.
Winchester 1400 serial # 136xxx. Will not feed shells and hangs up. Will extract shells fine. I know the winchester 1400's are problematic with this but can not find any information to fix this. I have checked the following:
magazine spring, checked ok
lift gate, ok
return spring, ok
right and left slide supports looked ok
no burrs on all the parts or abnormal wear.
Cleaned the entire firearm, checked all parts for breakage
made sure the gas ports were clear and in alignment.
checked the firearm with the pre 400k prints to make sure of no missing parts.
So any of you other fellers have any idea's on this. Well other than telling the person I am trying to fix this for to buy another shotgun