I have the original Sub-9 with all aluminum receiver (that I paid about $700 for in 1999) and I have put a thousand flawless rounds through it from 115 FMJ to 147 JHP. I do only use factory Glock mags (Glock 17 and Glock 33 rd. fun sticks through it, so maybe that helps the reliability). I would take it and trust it anywhere that I couldn't take my M&P15. Shooter521, do you have any experience with the original Sub-9?I'm not the OP, but having been inside a SUB2K and seen its Rube Goldberg-esque internals, you couldn't pay me to own one, much less bet my life on it for defensive use.