Samson Evolution QD Mount Black. The Samson Evolution HK Style Sling Loop w/ Stainless Steel Backer Bar mounts directly to the Evolution hand guard eliminating the need for a Picatinny accessory rail. The Samson 6061 T6 Aluminum Evolution HK Style Sling Loop is designed for HK style sling attachments and features a stainless steel backer bar to ensure it does not lose its hold. Specifications for Samson Evolution HK Style Sling Loop: Application: Shooting Accessory Features of Samson Evolution HK Style Sling Loop w/ Stainless Steel Backer Bar: Made of 6061 T6 aluminum Mil-spec hard coat anodized Stainless steel backing bar Designed for HK style sling attachments Package Contents: Samson 6061 T6 Aluminum Evolution HK Style Sling Loop Samson 04-03019-01: Evolution QD Mount Black