M4 quad rail system
Four Mil-spec Picatinny Rails for Versatile Accessory Applications

Simple and Friendly Installation, No gunsmith or Tool Required

Interlocking System Features Lower Mount Mating with Upper Mount for Most Solid and Secure Fit

Includes a Special Slot to Accommodate Rear Iron Sight Specially Designed Groove Rail Top for Optimal Viewing Through Front Sight

A Complete and Most Affordable Tactical Solution Offering Endless Options of Scope, Flashlight, Laser, Bipod, Foregrip on Your Favorite 10/22 Rifles