It's a great plan for someone who is already into guns. For a very first gun, it's a bad plan. Too many part, too many things to remember or get confused, etc.
He needs a Glock 17, about 5 extra mags, and as many boxes of 9mm defensive ammo as he can afford.
And a holster. Cops know that bad guys carry guns bare, good guys carry them in holsters.
He can learn. Keep the 9 mm conversion NIB until he does.
So, you think that for a new shooter, it's a better plan to spend $600 on a G23, another $175 for a conversion barrel (which no one has in stock anyway), a set of .40 S&W magazines, another set of 9mm magazines, a supply of .40 S&W, another supply of 9mm, all because... reasons?
Don't listen to gun doofuses. Get a full sized G17, get magazines and ammo to run in it, and get started. The only thing you get out of .40S&W is an empty wallet and wrist aches. Take that money and practice with more 9mm.
I found it in stick with a google search, the worst search for guns. Limp wristed poorfag.
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