What ammo were you using?
Remington 1400 bucket
The Umarex imported, Walther made Colt M4, M16 and HK 416 replicas are very accurate with their tensioned barrel system. I’ve found mine to be quite accurate at 200 yards when using minor magnification on my optics and quality 22LR rounds(not bulk ammo). Walther knows how to build a quality barrel and the tensioning system they use is excellent at minimizing negative harmonics. The all steel construction of these guns makes them excellent emulators for their center fire counterparts. I love my Smith & Wesson M&P 22 AR15 platform but the accuracy and feel of the gun is nowhere near as good as the Walther made guns.
I like the Walthers ARs realistic weight. Mine used to work a lot better. At this point it has a very high round count on it and I sometimes get feeding jams on a full magazine. Springs are probably worn. I should send it in I have it inspected.