TacFire Mosin Nagant 91/30 M44 M39 M38 Picatinny Rail Scope Mount Weaver Rail Type TacFire Official Product, Industrial Grade Aircraft Aluminum, Black Anodized Finish, Solid Construction Allows you to mount optics, such as red dots, reflex sights, holographic sights, long eye relief scopes onto your Mosin Nagant Total 16 Slots, No modification is required Clamps on tight and uses 3 set screws to hold an absolute zero Length: 6.61" Width: 1"