I switch back and forth a lot between the Archangel and the original stock. The Archangel is adjustable, so it's easy to use, but it's a bit of a chunk. It also soaks up more recoil than the OEM stock.
Either one gives me 2" groups at 100 yds (With both 147g 7.62 Nato and 168g match .308 Win). I'm sure the 2-7x scope I have on it helps, but even the iron sights are much better than any AR platform I've used. Fortunately, between the Army infantry and the Marines I worked with as a Corpsman training me to shoot, I was proficient at hitting chest-sized targets at 500 m with iron sighted M16's, so the sights on this rifle are just another bonus.