552/553/558 Red Green Dot Holographic Sight Scope Fit 20mm Picatinny Rail Mount
5: Easy to setup, fits any 20mm / Picatinny Rail. 2.558 scope is a holographic scope. Its red and green dots are relatively large. UK Picatinny Weaver Rail Snap-in Adapter Scope Mount Base 11mm Dovetail to 20mm.