LaRue Tactical LT135 SPR/M4 1.93" QD Rifle Scope Mount Places the center line of the optic 1.93" above the rail Eliminates the need to span from the receiver to the handguard Provides a more robust platform for the optics, increases repeatability, and eliminates the need for time-consuming lapping Precision-machined out of bar-stock aluminum Provides outstanding return to zero; the optic can be removed & replaced without loss of zero