The cover was designed specifically for mounting magnifying module and the module for night vision when used with a collimator mounted on handguard. It is also possible to consolidate the crosshairs right on the cover of the return tract. Cover return system interface to MIL-STD 1913 only marginally increases the size of weapons and construction is designed so that its installation was without any modification of weapons. It is made of high strength aluminum alloys in combination with steel parts. The surface is hard anodized in black. The arm is attached firmly and without intention, by original clamping mechanism and is easily and quickly removable. Of course, compliance with the alignment of the rail handguard and does not restrict the use of fixed sights. The design allows the use of sliding sights.