The Troy Modular Combat Grip allows shooters to keep their grip when things get dirty. Troy Modular Vertical Forend Grips offer versatility, unmatched durability and outstanding ergonomics in a grip that complements all Picatinny rail systems. Convertible from a standard length of 4-5/8" to a short 3-1/4" 'stubby' grip. The Troy Modular Vertical Grip has on board storage for batteries or other items and is precision machined from aluminum and features knurled bands for a sure grip.