Sometimes rubbish gets trapped in the stock recess below the cartridge lifter. Take the stock off and check, cleaning as required. If you can see marks in the woodwork where the lifter sits when the bolt is closed then that area may need careful deepening with a chisel. A safer alternative is to cut a spacing washer (from a plastic ice cream lid) to go around the stock retaining screw so the action is held slightly higher in the stock.
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