Board Thread:General Nerf discussion/@comment-37595644-20190413021845/@comment-27306930-20190413041644

Sorry, we need more info than that to help us diagnose your problem. CS-12s are generally pretty reliable. But certain clips can be temperamental.

Look, there's a wide range of solutions. You could just spray the heck out of it with WD-40 and see if the problem goes away. Or you might be able to use a Dremel to surgically remove some extra flashing.

But "sometimes" doesn't give us enough information.