One other nifty feature of the Sub 2000 is the ability to order it configured for other types of mags, a pretty handy feature if you want to match your concealed-carry weapon to your long rifle ;-)
From their website, http://www.keltecweapons.com/our-guns/rifles/sub-2000/:
The 9mm SUB-2000 can be configured in the following magazine types: GLK17, GLK19, S&W59, BERETTA92, SIG226.
The .40 SUB-2000 can be configured in the following magazine types: GLK22, GLK23, BERETTA96, S&W4006, SIG226.
When I bought mine (in Glock 17 cofig), I purposely took it to the range and shot it right out of the box without cleaning or anything. It performed flawlessly for three mags and all shots in the black from 20 yards. I added a folding foregrip to it and it was my motorhome weapon for years, stored in folded config with three 33 rnd mags close by.