Thanks, Jason.
I have two 15 round G19 magazines, two 17 round G17's, and one 33 round. I think Kel-Tec sells a "Glock 19" variant, but they simply shorten the grip for a shorter magazine. The one I ordered is a G17 variant.
So I do have three magazines that will supplement the one that comes with the rifle.
Got the rifle from a dealer in MN for $325 plus $15 shipping, which seems pretty low compared to Gunbroker et al. For some reason, the .40 cal variant is far more available, and the 9mm variants are being offered for a premium as much as $100.
Glad to hear you like the way it shoots. Most reviews give this gun a thumbs up. I hope all I ever do with it is plink and shoot at the range, but if necessary, it seems like a good supplement to the JCup armory, and uses the same 9 mm as my pistols. With a 12 gage backup, I'm ready for zombies.