This is a Magpul Industries Mount known as the Pro NVM - Night Vision Mount, model MAG1001-BLK.
The Magpul Pro NVM - Night Vision Mount is a solid yet versatile MIL-STD 1913 thermal and image intensified clip-on optic mounting solution designed and optimized for the Magpul Pro 700(R) rifle chassis. Precision-machined from a solid piece of mil-spec 6061 T-6 hard anodized aluminum" the Pro NVM provides a rigid" seamlessly integrated" repeatable" and easily-installed mounting interface for a wide array of popular clip-on night vision devices.
Features:
Easy to install
7.25 Picatinny rail length;4.5 oz. weight
