There is no lock. I traded for one today. I bought one of the first Ruger LCR's, and have been uncomfortable with occasional reports of flame cutting. I was waiting for the Stainless steel framed .357 LCR, and the LGS had the new S&W Bodguard on the shelf. I traded for it, and will look at a .357 LCR when he gets one. The shop had it on the shelf for $529 and would discount that for cash.