Meprolights MMX4 Magnifier is an ideal option for extending your accurate shooting range. The MMX4 is compatible with virtually any red dot sight and folds to the side when not in use, allowing to use the red dot to engage targets at close range. For targets at extended distances, the MMX4 can instantly deploy and provide 4x power magnification without the need to re-zero the red dot. Like all of Meprolights premium optics, the MMX4 utilize high-transparency glass and are built to withstand shocks, impacts, and sustained recoil.Features : Compatible with virtually any red dot sight Folds to the side when not in use deploys rapidly Provides 4x magnification