So I've gone through the thread and I'm still not really sure which gas jet I should buy for my 17 with a 16 inch barrel, and I don't want to run it suppressed. I've seen some people in the thread say they are buying the 1.35mm for their 17s, and some others aren't. I know PMM says 1.45mm for a Factory 17 with a 16 inch barrel, although they of course state that it isn't an actual recommendation.