I think the last time I posted anything concerning my Sig556 I hadn't even sighted it in. This is where I stand thus far.
I've got an EOTech 552 (I had a 1" group at 100yds using 62 gr. GrnTip ). Very happy with the EOTech, looking forward to the Magnification attachment when I get my Tax Return.
I replaced the front take-down screw with a K&N PushPin, much easier to field strip.
I have a UTG Swatforce 200 Lumen TacLite with pressure pad, $50 on CheaperThanDirt (So far Duct Tape has worked better than the included velcro for securing it).
I also purchased the NATO bayonet lug from MFIAP.COM. It said on the website that it wouldn't work on a SWAT model 556 but I just filed about 1/16" off of the end and it fit's like it was made for it, ROCK SOLID!
I use the shorter CommandArmsAccesories front grip so I can have a lower profile in prone.
I have been more than pleased with this weapon and I would encourage anyone who is looking for a weapon they trust to work every time the trigger is pulled to consider the Sig556.
p.s. The second to last pic, anybody know what that little lug on the right side of the rail is for? Mine is not the folding stock model, but I can't think of anything else it could be for.