I looked into this gun before purchasing my glock 17 (the ISSC M22) and spoke with three people who each owned one. They all had the same response. Utter garbage. Constant headache with misfires and jams. Feeding issues. "only likes certain ammunition, but I've tried EVERYTHING I can get my hands on and I haven't found that "certain" ammunition" One of the three guys had an issue with internals breaking after 200 rounds through it.
What I heard from local gun stores, plus those three gentlemen was more than enough to keep me away from it...
Just my $.02