I've seen various comments to the effect that "using a stock G17 mag w/ stock G17 spring and a factory +2 extension will eventually cause failures", ostensibly because the factory spring won't provide quite enough force for the last couple rounds. But I have not seen any credible recommendations on what IS the right spring for the G17 w/ +2. If there have been, I've missed it. As it is, I've got some brand new, non-LEO marked fullcap G17 mags that I put the factory +2 extension on. They feed fine, and when loaded w/ 19 rounds there doesn't seem to be ANY room left for additional spring coils. Today I spoke with a person in the tech department at Glock in Smyrna. They said that the above mag configuration should be just fine. They said that the latest/greatest fullcap G17 mag springs have 10 or 11 (couldn't remember exactly) coils while some older ones came with 9 coil springs. Anybody got reliable info on problems with this mag setup? If you did have problems, what fixed it? Thanks in advance.