OTIS Technology has recently started shipping its new MSRS 2-piece rail system. The company designed it with the military customer in mind, so it provides strict adherence to the Mil-Spec standard, as an expedient and cost effective means for the military to upgrade the existing M4 inventory. The MSRS is a carbine length system that attaches to the weapon’s existing barrel nut thus eliminating the need for non-standard barrel nuts or barrel removal for installation.
The MSRS has the best fit and finish that I’ve seen in quite some time. In fact, it is so precise that your carbine will look like a monolithic rail system. You need to give it a try on your next build or if you’re looking for a quality upgrade to your weapon.
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