I don't understand how you can say the 552SD is unaccurate..?
Try using it on single shot, the bullets go exactly where the aimer goes, although on fully automatic the recoil is pretty much a piece of crap. Just sit in a bush and crouch and lean and when you see someone, single shot them over and over, if they get close, come up behind them or run out of the bush and fight them face to face. The 552SD isn't that inaccurate or weak so it shouldn't be too bad to kill someone in a firefight.