The trouble with the SP101 is it is really kinda heavy for the ankle or pocket. Thus eliminating two great carry methods for a “Rule 1” gun. They are also too heavy to do the slip-on appendix holster and gym shorts thing with.
You have to get down around 16oz or less to make them work in all of those roles.
Which means if you want a 9mm gun the Ruger LCR is your Huckleberry.
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Let’s talk about 9mm vs. 38 Special for a minute -
If you own another .38 Special revolver, you can buy an Airweight J-frame, which is a bit smaller than the LCR in most dimensions and load it with 148-grain wadcutters. You have other .38s so you should have WCs on hand in general.
If you do not own another .38 revolver - don’t start now - when the 9mm LCR will do everything an Airweight J can do, except it’s an ounce or two heavier and a wee-bit bigger.
The only things I don’t like about the LCR is the slightly bigger size, the stock grips from Ruger (too sticky for pocket carry) and that the 9mm guns need a different height front sight from the .38/.357 guns.
If I had zero revolvers and was starting out today the 9mm LCR is what I would get.