This is a Yankee Hill Machine Co known as the 30 LT(A) QD Mount, model YHM-4302-AK-A.
High quality components and precise manufacturing make Yankee Hill Machine Co. parts ideal for maintaining and upgrading firearms. The durability" reliability and excellent build quality of these parts will ensure years of service you can count on.
Features:
Precise Manufacturing
Long Term Reliability
Durable Construction