A lightweight but solidly built AR-15-style buttstock, the American Built Arms Urban Assault Stock (UAS) stows in its most compact form, yet features a spring-loaded buttpad that can be set to deploy to any of four lengths (for a total adjustment of 1.25") at the push of a button. Compatible with both mil-spec and commercial carbine-length buffer tubes, the 7.1-oz. UAS also incorporates QD sling swivel mounts on each side of the stock and a five-slot section of Picatinny rail along its bottom surface for the installation of a stabilizing monopod. Price: $60. Contact: American Built Arms Co.; (443) 310-8777; abarms.com.