The cartridge cut-off sits in the left side of the rec'vr wall. It pivots up and down as the action is worked. It should pivot down and block the shell in the mag in back of the one that is being pushed onto the carrier.
When the action is closed shut, the cut-off pivots upwards and allows that shell that it had blocked to then jump back and into position against the small lug on the underside of the bolt,,ready to be loaded next.
If it's not blocking the shells in the magazine,,it may be worn at the back end of it and not moving/pivoting the correct distance anymore.
It may be worn on the front edge that actually contacts the shell (rim) to block and hold it in the magazine.
It may even be bent from a well intentioned attempt at improving function.
The part is under no spring tension at all.
You can remove it easily by removing the trigger guard assembly from the recv'r.
Take the small screw out from the rear 'tang' of the guard and pull the entire guard assembly complete with carrier out of the gun.
The cut-off can then be simply taken out of the receiver. It'll just drop out of the left wall of the recv'r.
Clean the recess it sits in. Check the part over for wear. It may even be bent a little. People do funny things to guns sometimes to 'improve' them.
***If you take the carrier itself off of the trigger guard assembly for any reason,,the large flat head pivot screw is a LEFT handed thread.
