I see a number of M4geries fielded by officers who furnish their own rifles. Being the Dept. armorer, I get to sort out their little quirks, shoot them, etc. Granted, none of these rifles are Colts- but your typical generic M4 does not shoot significantly better than my old WASR with a barrel re-crown using Tula FMJ. For a using gun, I prefer the AK.
“Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals. It can only be ensured by instinct, sharpened by thought practicing the stroke so often that at the crisis it is as natural as a reflex.” ~ T. E. Lawrence