we had to have the trigger adjusted for 4H. I'm wondering if it fell out then.Turn your rifle upside down and youll see where the block should be
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Take out the two action screws front and rear of the trigger plate, lift your stock away, and youll see where the block/pin should go.
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Im curious how that pin worked out to drop the block while it was snugly inside the stock. Doesnt seem like there would be enough room.
Regardless, thats where your problem is