Trijicon ACOG Extended Eye Relief Picatinny Rail Adapter

Many ACOG models were originally intended for fixed-carry handle rifles, where the sight sits closer to the shooter’s eye; on a flat-top AR/M4 platform, this can leave the optic mounted too far forward, forcing awkward cheek placement or poor sight alignment. The extended rail adapter solves this by sliding into the standard MIL-STD-1913 Picatinny rail and providing a rearward mounting position for the optic, improving ergonomics for a wider range of shooters and shooting positions.

Machined from rugged aluminum and finished for corrosion resistance, the adapter maintains a solid interface between the firearm and optic while adding minimal height and weight. Its design makes eye relief adjustment simpler and more consistent, whether you’re transitioning from iron sights, adjusting for body armor use, or setting up for rapid target acquisition in dynamic environments. This accessory gives shooters increased flexibility in customizing their setup to fit their stance and comfort without compromising the inherent toughness and precision that ACOG scopes are known for.