Product DescriptionThe LUTH-AR GrovTec Threaded Base Cup is a compact, steel sling-mount insert designed to accept a quick-detach (QD) sling swivel. It threads directly into the side cup holes found on Luth-AR MBA buttstocks, providing a clean, low-profile QD attachment point on either side of the stock. Installation can be performed with a separately available installation tool or a standard 1/4" Allen wrench.Product Highlights Accepts QD sling swivels for fast on/off sling attachment. Threaded design installs into side cup holes on Luth-AR MBA buttstocks. Fits MBA-1, MBA-2, MBA-3, and MBA-4 buttstocks (left or right side). Durable steel construction with a black finish for a rugged, low-profile look. Simple install using a 1/4" Allen wrench (installation tool sold separately).Specs Brand: LUTH-AR Manufacturer Part Number: GT-CUP UPC: 859992007548 Product Type: QD sling swivel threaded base cup Material: Steel Color/Finish: Black Attachment Type: Direct thread Compatibility: Luth-AR MBA buttstocks (MBA-1, MBA-2, MBA-3, MBA-4) with side cup holes Installation: 1/4" Allen wrench or separately available installation tool Quantity: 1 base cupDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.