Congrats, that's cool.
BTW, most will refuse to comment until pics are posted.
AND, I have a stock Gen 3.5 (old frame, new RSA) and it shoots Underwoods just fine. Don't change a thing. Just buy ammo. I shoot the 20 mags without sleeves so I can't help you there. Have fun!
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The two loudest sounds known to man: a gun that goes bang when it is supposed to go click and a gun that goes click when it is supposed to go bang.