I have an MSAR that is a customers and it is a big pile of junk. It has been a problem from day one. The reason I have it is he tried to take his flash hider off to attach his suppressor to it and he broke the flash hider. He did not know that it has a left hand thread. This is what hurt me. The flash hider to replace it from MSAR was $53.00. I would dump that thing so fast it hurts!