The EMR-H features a slightly curved button surface to fit the natural curvature of your finger. The form fitting curve, along with horizontal serrations, create a self centering surface that inhibits the finger's vertical movements. The EMR-H has a milspec through hole for the magazine catch's shaft, and is only 0.02" taller than the factory magazine release button. When installed, the EMR-H has minimal protrusion above the mag release button fence on most forged receivers.
Machined from 4140 bar stock, it is QPQ coated.