This is a Daniel Defense Mount, model 03-047-07146.
Daniel Defense has expanded their line of optics mounts to offer secure mounting for the most standard size scopes. Daniel Defense variable power scope mounts are available in 1" and 30mm tubes. The variable power scope mounts weigh in at just 5.5 ounces and are manufactured with the same quality and durability you've come to expect from all Daniel Defense products.
Features:
Precision machined from 6061-T6 Aluminum
Type III Hard Coat Anodized finish
Features Daniel Defense's patented Rock & Lock mounting technology