Description The UD Picatinny Chassis takes the proven platform of the UD Chassis, and replaces the traditional buffer-tube interface with a robust, rear Picatinny mounting interface so the buttstock detaches quickly for compact transport or tight storage without compromising repeatable return-to-zero. The chassis accepts their adjustable grip system so shooters can customize trigger-finger distance to their preference, and the adjustable thumb rest lets you tune positioning for repeatability and comfort.