RHF4 incorporates Forward Controls design input: Omission of built-in QD swivel attachment points. Some like the now common front and rear located QD sockets, we prefer the location of the front sling attachment be left to individual users. A BCM rail mounted QD sling adapter is included (the QD sling adapter can be removed in the drop down menu if you don’t need it, or already have one, please see the QD sling adapter drop down menu). The rail numbers are machine engraved, and a subdued Cygnus is engraved on the right side of the RHF4. FEATURES: – Material: 6061 T6