I am looking for a good mount for a LAS/TAC. Im running a M500A so my mount options are very limited. So really my only options are a Barrel Mount, Bayonet lug mount, or a FS Mount. I am looking for a mount that will hold the best zero. I found a BMAS Triple mount but I've been advised this mount is a gas block and not to mount a laser on it. I also found a dual rail FS mount but not sure how it will hold a zero. Any Suggestions/pics of their mounts would be appreciated