Luth-AR GrovTec Threaded Base Cup Features The Luth-AR GrovTec Threaded Base Cup solves a simple but important problem for MBA buttstock owners giving them a proper quick disconnect sling mounting point without modifying the stock itself. The cup threads directly into the factory molded side cup holes found on both sides of the MBA-1 MBA-2 MBA-3 and MBA-4 buttstock frames meaning a sling can be mounted on either side of the stock to suit a right or left handed shooter. Because the cup accepts standard QD sling swivels shooters can quickly attach or detach a two-point or single-point sling as needed for training hunting or storage. This flexibility makes the base cup a practical addition for anyone running a Luth-AR adjustable stock who has not yet added a sling mounting solution. Machined from steel and finished with a durable oxide coating the base cup is built to handle repeated sling attachment and removal without wearing out the threads over time. Installation is straightforward requiring only a 1/4 Allen wrench or GrovTec s separately available installation tool so no gunsmithing or special equipment is needed to add one to each side cup hole. At roughly .8 tall and 2.3 wide the cup adds minimal bulk to the stock while giving it a far more versatile sling mounting system. For Luth-AR MBA buttstock owners this GrovTec base cup is an easy low cost way to add proper QD sling capability to an already adjustable ergonomic stock. Luth-AR GrovTec Threaded Base Cup Specifications Manufacturer: Luth-AR Model: GrovTec Threaded Base Cup Compatible Hosts: MBA-1 MBA-2 MBA-3 MBA-4 Buttstocks Mount Type: QD Material: Steel Finish: Oxide Color: Black Height: 0.8 Width: 2.3 Weight: 0.02 lbs Available At: GrabAGun