Dave will probably add his expertise soon, but if you get a 3"..buy a LOT of extra recoil springs. I think Kimber recommends changing them every 500 or so rounds..and if she uses it for anything other than range, i.e. a carry pistol, don't use a shock buff..it wont let the slide function. Actually, I wouldn't use them in any carry pistol. Good luck
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Wilson Combat CQB
Kimber Tactical Pro II
S&W J-Frame .38
ect
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COTEP #523