Quote:
Originally Posted by Dan Ray
What is the difference in frames 1, 1.5 and 2. Also o, oo and so on
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the frame gets larger as the number goes up, so with in a gauge you may find a lighter gun on one size and a heavier gun on another
you can determine frame size by measuring the distance between centers on the firing pins
so for example - you will normally find 16's on 0 and on 1 frames
a heavier 12 may be on a 2 or even a 3 while a lighter 10 may be on a 2.
the Parker Story goes into more detail.