Just bought this Trap Grade M21 gun. It came with Cody letter, serial numbers match, stock fits. Put 250 shells through it.
Went home, put safety on, removed fore arm, cleaned gun and reassembled gun but the forearm would not go on. The ejector hammers can forced back but do not catch on sears. The hammer cocking levers at the end of the action are loose and do move.
HELP!

danc