This LaRue Tactical Picatinny Riser Legacy QD Rifle Scope Mount raises any optic by 5/8" above it's host rail. Some guys are putting it on the underside of the handguard and mounting vertical grips and flashlights to it. This makes for a pretty good setup. The LT101 is 5.5" long, and provides 13 MIL-STD-1913 lug spaces. Like all LaRue mounts, it is precision-machined out of bar-stock aluminum and matte black anodized. The LaRue Speed Levers provide outstanding return to zero; the optic can be removed, and replaced, without loss of zero. FeaturesDual QD leversAnodized finishSolid lockup