It's a pity if not ridiculous that the SDAR doesn't have a rail mount. An argument that I've heard why the SDAR has no rail was, because the sights wouldn't work underwater, but that's absolute nonsense. Near EVERY sight from Aimpont or EOtech work underwater to 150 feet. Yes, the deep usually go much further than 150 feet, but then you should rather do so that the sights are disappear at bigger depths, instead of completely deny the possibility to mount it. And why sights doesn't work underwater in 2035 is anyway somewhat questionable...