DevL,
I went with the 16" barrel because 99% of my shooting will be with m193 and M855 mil-spec ammo. My SHTF ammo supply is also M193 so I feel the 1/9 twist would suit me better since it's optimized for those bullets. I may try the heavier stuff every now and then and I under stand may be able to go up to the 75gr but I don't know how often I would even shoot those rounds.
The other reason I went with the 16" is because I rather have the threaded flash suppressor than a welded or pinned one. I like to be able to change it when I want. I feel this gives me more options especially if I can get that sound suppressor I've been thinking of. [;)]
Also, I hope my wife not reading this, having the 1/9 will give me a new excuse to buy another upper next year with a 1/7 barrel. Heh, heh, heh...[}:)]
Regarding the Vltor, I chose it because I like the battery compartments, modular setup and it looks to be the best bang for the buck in the stock line up. Now, I've only gone by the reviews I've read here so I've not tried the M93 but I really don't see where it does more then the Vltor for the amount of money it costs. Like I said I'm still getting my parts together so I may still change my mind...[:D]
mr_wilson,
Thanks for the links to the weight charts!