I'm on the fence...which one would you pick if you only could choose one .223/5.56 Full Auto rifle?
Sure there's an HK33/93 .22LR conversion kit. I've got one and it works great. They're not as common as the .308 kits, but they're out there.As a toy, AR15. I shoot allot of .22 and there is no HK .22 conversion for a trigger pack or host gun.
As a tool, HK. More reliable and at least equal in accuracy, trigger quality and ergonomics.
I own several versions of both, M16 with .22 uppers get more hammering.
At this point, I'd go with an HK33, but mostly because I know it inside and out, I can shoot it really well, and I know it can handle any situation I might find myself in. I can literally take it apart and reassemble it in the dark. I'm not nearly as familiar with the stoner rifles. If I knew them like I do HKs my answer might be different, but for now, HK.Sorry... gun aginst gun in combat for their intended purpose. Just some chatting at the range today with a buddy and wanted to see what others opinions were for weapon choices between the two.