I remember the days when anything inside of 600 meters was as good as dead with a C1 - with open sights!
If you ever had to butt stroke someone with that rifle, it would be lights out. Not sure if the C7 would be quite as effective there. I don't want to start a flame war here, but an updated C1 would still be my ideal issue rifle.
18" paratrooper model with folding stock, rail the upper and forstock, and you could have one hell of a weapon. Or just buy the SCAR-H.