This is a Magpul Industries Adapter known as the M-LOK Dovetail Adapter, model MAG1051.
The M-LOK Dovetail Adapter features multiple drilled and tapped holes that are optimally located to limit overall travel of accessories. It has comfortable" yet functional" snag-resistant beveled edges. It also includes a hardware access feature to allow removal of the front action screw on a rifle mounted on a Magpul Pro 700 rifle chassis without the need for removal of the Dovetail Adapter from the chassis
Features:
Compatible with RRS Dovetail Standard compatible accessories
Mounts directly to M-LOK compatible systems
Multiple drilled and tapped locations for hardware installation which limit over-travel of accessories while also serving as reference points
