Quick Detach Tubelock Back Plate for Folding Stock Adapter - The Sylvan Arms QD Tubelock is a replacement for the standard lower receiver end plate that adds a quick detach on the RIGHT side and works with our Folding Stock Adapters. CNC Machined from 7075 Billet Aluminum with a black finish, the swivel socket is rotation limited for easy use. This product, like all other Sylvan Arms products, is also backed by the Sylvan Arms Limited Lifetime Warranty. It makes for a great addition to any folding stock adapter or build.