i also have a top lever hammer gun that is a 6 frame so marked..it is 1 3/8 across center to center of the firing pins...i have a lifter gun serial no 25403 the frame size is not marked but it must be a 7 frame cause the center to center of the firing pins is1 1/2 inches plus a 1/32a much heavier gun than the 6 frame..just checked another 8 ga parker hammer gun the one i got from mills it is a 6 frame top lever hammer gun..it is also 1 3/8 across the fireing pins center to center..
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