Regarding the NJSP guns. If they are SW99 set up in the P990 configuration, they will operate exactly like the Glock. If they have the QA(Quick Action) they are entirely differnt from the P990. The QA feature partially tensions the striker. It's like your Glock not having the first part of travel where it brings the striker to tension, instead the QA is at the point where the Glock is ready to drop the trigger. It's pretty wild. I carry a Glock 17 for duty, but just picked up a P99QA .40Auto for occasional duty usage and off-duty carry. I find this is the sweetest .40 cal(Glock 23,22,27 SIG P229, S&W 4006)I have ever shot, and subsequently put my two-month old P229 up for sale.
Be Safe
Mike
PS No flames about the SIG, it was a great gun, but it's one or the other, and I find the Walther much more of a joy to carry and shoot.