S&W 3rd generation pistols take some getting use to. I now have 19 of them (including a 4516-1 and -2). I also have 8 or 9 S&W revolvers (.38, .357 mag and .44 mag). Because of the triggers and grips, 3rd gens are very different, especially 3rd gen compact models. No one is doubting your experience with revolvers . . . or even with other autos. But, like I said, 3rd gens are different. FWIW

Good luck.

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1st Signal Brigade, RVN '70