556 works fine, tap tap is all it takes for most.
but i have like other hear, see some ####*d Up SH*T happen to people, ie being shot many times and not going down.
I have been there, you say to yourself i hit the f**ker, then he gets up and runs away leaking all over the place, really pisses you off.
I think the + of the 556 is that it is light , low of recoil so lets you takes better faster aimed shots.
The 762 rules but you hump 80lbs of kit and add another 25 for an FN, M14 ect, then tell me whats better.
I never had to hump the FN but i did have to hump the sa80 and that was a POS other then on the range.
Best gun i ever used was a 16" fn para in 308, love that gun.
bbb