The MOD 2 uses the same fold out arm to as its siblings to create the support shelf that inspired the Tailhook name. This counteracts the muzzle weight of your favorite large handgun. The telescoping feature lets you find that sweet spot for balance. As an added feature, the outsides are smooth for comfortable cheeking. There is even a web sling loop. Included in the package is the Tailhook, proprietary receiver extension, castle nut and back plate. It will accept any carbine length buffer and spring.