RS Regulate Modular Upper for Trijicon ACOG Features The RS Regulate Modular Upper is one piece of the company s AK-300 Modular Side Mount System first introduced in 2012 and since expanded to six fully modular uppers and nine different lowers. This modular approach lets a single upper pair with the correct lower for a given AK variant whether that is a front-biased rear-biased or full-length lower for most Eastern European AK side rails. The system also extends to Yugo and Serbian rifles PSL and Romanian M10/RH10 rifles Century Arms proprietary side rail and even a rear-biased lower for the Czech vz. 58. This modularity means the same upper can serve across multiple AK platforms simply by swapping the lower half of the mount. Built specifically to fit the Trijicon ACOG this upper gives AK shooters a mounting solution engineered around the exact dimensions and eye relief the ACOG requires. The matte black finish matches the finish of most AK rifles and ACOG optics keeping the overall setup visually consistent. Because the mount attaches to the AK s side rail rather than requiring a receiver cover swap or gunsmithing installation stays straightforward for the end user. RS Regulate s reputation in the AK optics-mounting space makes this upper a trusted choice for shooters looking to add a rugged combat-proven ACOG to their rifle. RS Regulate Modular Upper for Trijicon ACOG Specifications Manufacturer: RS Regulate Model: Modular Upper Type: Mount Color: Black Finish: Matte Compatible Hosts: Trijicon ACOG AK-Pattern Rifles Available At: GrabAGun