Have never experienced it and in all the carbine courses I have taken, 6 to be exact, none of the LEO instructors or military instructors have ever mentioned it. I've never read about it either in any of the several books I have on ARs.
You can usually adjust your collapsible stock via a screw that loosens or tightens the release lever, that may be playing a part. Regardless, this should be pretty straight forward to reproduce and then deduce whats wrong by manipulating it.
Ah HA! I think that's the first mention by the OP that the stock was on an AR carbine. All the replies just filled-in that blank. I HAVE seen a shotgun completely wreck a (cheap) collapsible stock. Yet I've never seen it on a mil-spec AR.
A forum community dedicated to defensive firearm owners and enthusiasts. Come join the discussion about everyday carry, optics, holsters, gunsmithing, styles, reviews, accessories, classifieds, and more!