Recently bought a Hohosun 530 to put on an ar pistol. Really, really satisfying to shoot. Then, front lens cover started popping open. Then. It would not snap completely shut. Then, it wouldn't stay closed at all. Was about to call em to whine when I discovered that if the killiflash isn't screwed all the way in, the cover will not snap closed. Problem solved for now....

Fwiw.....