Not familiar with B Squared but I'm assuming it's like any other scout mount that replaces the rear sight leaf and spring and mounts in with two allen screws. I've got one on my M-44, don't exactly recall the brand, but I recommend liberal use of red lock tight. I installed and took it out with a cheapo red dot (NcStar) and within the first 3 rounds, the mount had worked its way loose. Took it back in, rolled the threads with red lock tight, reinstalled, let sit for a couple hours to dry, took it back out, 25 rounds later and it wasn't the slightest bit loose.