I know this is probably come up a lot, but I know the TLR-6 hasn't been out that long and I honestly don't have time to read through a hundred threads to see if anyone has done what I am curious about. I carry a Gen 4 Glock 26. I have a Streamlight TLR-6 on it, and in colder weather I sport it with G19 mags, X-Grip, and Concealable Controlled baseplates (which I also use on my G26 mags). I try to hold onto enough ammo to get me through a shortage, but I admit I don't have 10,000 rounds stashed. When it was bad years ago, I literally ran out but .40 S&W was always still on the shelves. I've also been thinking of selling my G19 and getting something else (I always want to try new guns), and as such, I wanted to tease out my G26 as much as possible; so I thought maybe I'd sell or trade my G26 for a G27 for a few reasons. Specifically, I was thinking about getting something like a KKM or Alpha Wolf THREADED conversion barrel to 9mm. My my thought is that velocity is mostly a wash (whatever I'm losing drifting away from polygonal rifling I'm gaining with the extra length of a threaded barrel. Correct me if I'm wrong, but I also assume the whole barrel will be slightly heavier because of the subtle increase in diameter of the .40 barrel fit of the G27 slid. I know I'll need to get an 9mm ejector, extractor and [I believe] spring-loaded bearing to ensure it runs as well as the G26. The internals of my G26 at the moment are all stock, but I was thinking of getting a steel or tungsten guide rod. Here's my question, with a metal guide rod, extra diameter of the LONGER threaded barrel, and a TLR-6 mounted on the front, will that change the shooting characteristics of the gun in a positive or negative way, or is it going to be marginal at best (if not impossible to notice)? Any other thoughts are welcome, even if only to tell me to leave my G26 as is. Thanks in advance for your help.