Will,
Put a piece of freezer tape on the back of the frame, where the rear toggle hits it. Fire one round and check the tape. When it is functioning correctly, the tape should have a dent in it. If the tape is smashed and torn through, the mainspring is too weak. If the tape is very slightly dented or not dented at all, the mainspring is to strong. This will give you a starting point, so you'll know which direction to go.
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Mike C.
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