Got it. Help arrived on another forum. If you ever get one of these 220s in and need to get into the receiver, this is what helped me: "The lower 2 pins hold in the trigger/hammer assy. The next pin up holds the locking bar. The top pin holds the firing pin. If the hammer is dropping when the trigger is pulled it is quite possibly the firing pin. Easy fix. Parts are available from Numrich Gun Parts Corp. IIRC, remove the trigger assy first. Remove the firing pin and replace. Reverse the rest. Hope this helps. "

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