Driven by a law enforcement agency’s request for an adjustable, but non-telescoping, AR stock, the Survivor Systems’ Professional MCS model offers length-of-pull changes by way of four included spacers. Compatible with any mil-spec carbine buffer tube, the stock also serves as a storage area for a spare AR-15-style magazine which locks into place and can be released via a familiar magazine-release button. A top-mounted slot and right- and left-side swivel cups provide sling-mounting options. Hardware and an Allen wrench are included for installation. Colors include Flat Dark Earth, Phantom Gray and Black. Price: $110. Contact survivorsystems.com.