Looking for a foundation for a MK18 build? Look no further, Brownells has put together a few items to help you make the decision! The Daniel Defense MK18 SOCOM Upper Receiver, with a B5 Buttstock, and an Eotech EXPS3 Holographic Sight. Daniel Defense manufactures the highest quality AR-15 upper receivers on the market today! Every Daniel Defense upper is painstakingly hand assembled, quality assurance tested, and test fired to ensure that the highest quality product makes it to the hands of customers. The upper receiver is mil-spec with indexing marks and M4 feed ramps. CNC Machined of 7075-T6 aluminum, type III hard coat anodized, color is black. The barrel Mfg: Brownells