Magpul is the name that comes to mind for most people when they mention AR-15 accessories. There is a good reason why that is; as their parts are bombproof and virtually indestructible. 

Designed for use with all M-LOK mounting surfaces, the M-LOK Polymer Cantilever Rail/Light Mount allows the attachment of various MIL-STD-1913 Picatinny-Spec rail-mounted accessories such as lights and optics. It directly interfaces with the popular Surefire® M300/M600 series Scout Lights or Magpul Light Mount V-Block and Rings. The Cantilever Rail/Light Mount has Picatinny slots that extend forward .75"-1.5" past the M-LOK mounting slot to improve ergonomics and optimize accessory positioning in a wide variety of uses, while keeping lights and accessories low to reduce the weapon's profile.

Molded from heavy-duty reinforced polymer to save weight and expense, the Cantilever Rail/Light Mount also features beveled ends and corners to reduce snagging and sharp edges.

All hardware necessary for attachment directly to M-LOK Slots on either aluminum or polymer hand guards and forends is included. 3 MIL-STD-1913 Slots, max overall length of 3.15".