I've read that a very few folks have had negative accuracy problems with their .22 Marauder...mind you, I said a very few.The end cap on the shroudwhere the pellet exits,thealignment of the spacers behind it,the movement/positioning of the shroud itself, and the alignment of the barrel bore axis with the aforementioned stuff....can affect accuracy negatively. It seems that the spacers have a little play in them, because their OD is not quite snug with the shroud. If one or more spacer(s) get misaligned, then the pellet can get clipped basically and this can affect accuracy negatively. The fix is basically to enlargethe hole in the endcap and spacers to a little more than it is now...then allowing a pellet to pass thru the holes without clipping. The .177 version is not affected, because all the holes are already big enough...and the spacers play is not enough to affect that caliber.
Has anyone here had any accuracy problems with their .22 Marauder thats tied to these things I mentioned?