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In my old day job I carried one quite a bit. I enjoyed the rifle as it was, it definitely served its purpose in the environment I had it. I just am looking to see the improvements vendors have made, plus I enjoy modifying everything I touch.
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In that case I'd also take a look at the Handl Advanced Fore-Rail. I was looking to get one for my 16S but they were sold out at the time and I opted for the KDG instead. I have absolutely no regrets with the KDG, but the carbon fiber offering from Handl would have been great for desert use (doesn't get nearly as hot in the summer). I do like the lowered rail in front of the gas block on the KDG though, it's prefect for mounting an X300U to.
Not on your list but I did run a GGG charging handle for a while on my 17S, and while it definitely served it's purpose I noticed when slung it did tend to snag up on stuff, which annoyed me. I've since gone back to stock and learned to live with it. Just something to keep in mind. And on the subject of slings, since you're jumping into PMM stuff, you could look at their QD mounts.
The H1 will keep the setup light and usable, but if you'd going to be doing any kind of 300+ yard work I'd probably go with the 1-6. You could probably put both on QD mounts and swap out as needed too and in true Arfcom fashion could get both.
You could try the
Shooting Sight FCG instead of the Geissele. Haven't seen too many reviews on it but might be something up your alley.