RS Regulate Modular Upper Features The RS Regulate Modular Upper is part of the AK-300 Modular Side Mount System a mounting platform RS Regulate began rolling out in 2012 that now includes six fully modular uppers and nine different lowers to cover the wide variety of AK pattern side rail configurations found across Eastern European Yugoslav Serbian Romanian and Czech rifles. This particular upper is machined to accept the Trijicon RMR footprint giving AK owners a direct secure mounting point for one of the most widely used red dot footprints on the market. Finished in matte black the upper is built to match typical AK receiver finishes for a clean factory-look appearance once installed. Because the system is modular this upper can be paired with whichever lower matches the specific side rail geometry of a given AK variant from a front-biased Eastern European rail to a Century Arms proprietary rail. The modularity of the AK-300 system is its defining advantage since AK side rail mounting points are notoriously inconsistent across manufacturers and countries of origin and a mismatched mount can leave an optic canted or loose. By separating the system into interchangeable uppers and lowers RS Regulate lets an AK owner assemble the exact combination needed for their specific rifle without redesigning the entire mount. This upper s Trijicon RMR cut means it is ready to accept an RMR directly without an additional adapter plate. For an AK owner who wants a properly fitted Trijicon RMR mount rather than a generic universal rail this RS Regulate modular upper is built to solve that fitment problem. RS Regulate Modular Upper Specifications Brand: RS Regulate Model: Modular Upper Type: Mount Optic Fit: Trijicon RMR Color: Black Finish: Matte Available At: GrabAGun