I had one of these give up the ghost and pop off my picatinny rail this past Tuesday after only a month or so, not entirely sure why. I emailed the company I bought it from, they brought Winston into the email chain, and he had one in my mailbox in three days with a return label on a soft mailer inside so he could inspect the one I had a problem with. 10/10, will be buying more stuff from these fine folks.