FWIW the dimensions of the safety cutout on the frame of the 1.0 vs. 2.0 and the corresponding plugs look identical to me. Haven't pulled out the calipers to check this however. Likewise, the dimensions of the ambi safety appears the same as on the 1.0 vs. the 2.0, except that now Smith shaves off about a millimeter on each side, probably to make the overall dimensions a little more narrow and to make it less easy to unintentionally engage or disengage.
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