Quote Originally Posted by Shed tuner View Post
indeed. My money is it's mag related - either that or silencer clipping. Barring catastrophic physical damage, those are pretty well the only two ways a gun can go from accurate to shotgun - either my smahing up on the pellets on the way into the barrel, or smashing them as they leave.
I've had barrels with slack spots do it before at long range (50m) but I think like you, either a mag or muzzle attachment is the usual root cause and they're the first things I remove if I can when troubleshooting.