 The Marines of 1st Battalion, 6th Marine Regiment, head to the ranges on Camp Leatherneck, Afghanistan, to hone their skills using the Mk.12 service rifle. The Mk.12 is a specialized, long-range rifle used by the designated marksman in an infantry squad. The Mk.12 system is perfect for what it's designed for. It's a great squad-sized weapon that's designed to be a bit more accurate than an M16, actually a lot more accurate. And at the same time it doesn't require a whole lot of training behind the system to actually understand it. They kept it on a simple level, many Marines have used it for years and it's been doing its job. With this training, Marines will be able to successfully do their job behind the Mk.12 service rifle.