Magpul® M-LOK Polymer Rail, 5 Slots
The M-LOK QD Sling Mount provides a forward attachment point for the Magpul MS4 Sling and other push-button QD slings. Machined from Mil-Spec anodized aluminum, the low-profile M-LOK QD Sling Mount features beveled edges to reduce snagging and has an anti-rotation design that prevents swivels from spinning.
All hardware necessary for attachment directly to M-LOK Slots is included and and no modifications to the M-LOK hand guard or forend is required.
Made in the USA.
Blue Force Gear
It's super solid, and about as minimal as possible. obviously fits magpul sling swivels just fine.