Lightweight, American-made accessory for MS3, MS2, VCAS, and VTAC slings. Shop now at Ubuy Panama. . Enhance your Magpul UBR with CSAP MOUNT-N-SLOT. Slot molded in the toe provides an attachment point for a 1¼" wide sling. Lightweight, American-made accessory for MS3, MS2, VCAS, and VTAC slings. Shop now at Ubuy Puerto Rico. Also includes the same detachable rubber buttpad found on Magpul CTR and UBR. Enhance your Magpul UBR with CSAP MOUNT-N-SLOT.