The SRS ARCA rails - the lightest in the market and the only ones that complement a rounded style hunting stock. The Arca + pic allows for the use of a single rail to mount a bipod and tripod, with 1.7" of ARCA rail and 2" of pic rail. Made of 7075 aluminum, it has a 4" OAL and 1.2" to 3.0" bolt spacing, and a sling stud hole. Ideal for fore end use in declining shots where a tripod is preferred over a bipod. Weighing just 1.0 oz. 10-32 threads.