Rail system for CYMA AKs74u(Krinkov)

Hi! I've made a RIS system for my krinkov replica. It's not the average modern looking, it's the tubular shape. It is made and tested with the CYMA CM035 but i think it will be good for other versions too. Pics are with custom muzzle device, but the classic 35MM silencer fits too. Battle tested with horizontal grip. To assemble you will need 4 pcs of M4 nuts and 4 pcs of M4 x 30 screws. Put the gasblock to it's position, insert the screw/pin, then slide the rail system to it. Place