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Hi Harold, hi George,
The Colt conversion unit firing pin is round as seen from the front. It is flat, with the edges rounded somewhat but it is neither dome shaped nor rectangular.
My thought is whether things work OK with the .45 slide in place, and whether anything has been done to the hammer or spring.
Another thought is the ammo. Some of the hot new .22s have harder cases than the older ammo the conversion unit was made for.
If none of the above apply, and the unit is clean, try George's idea of stretching the firing pin slightly. It does work.
Jim
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