[Oregunner]

Take the rear stock off and watch what is happening. A stray pellet can get almost anywhere and when it gets squashed, it's sometimes hard to notice. Mark

 

[GunDr]

Taking the stock off and it should be apparent what's going on. If the inertia block is not slipping under the sears, highly likely some shot migrated into the back of the action.

It would be wise to tear the whole receiver down, because the shot get be about anywhere...even slipping through the top lever spring, causing the top lever to bind.

 

[wireguy]

Crushed flattened lead shot can disappear into grey gun metal in the most amazing way.

 

[stokinpls]

Mine wouldn't close one time, and the trap kid scoring says, "I know what that is!". He flipped the lower extractor back and raked out a flatten pellet that looked to be paper thin. I finished the round and it never happened again. I realize now, I should have tipped him.

Bob Falfa