The Borka torque wrench accepts 1/4" hex bits, is small enough to fit in your range bag, easy to use and is less than half the price of other similar products.
12 Setting Driver
6 Setting Driver
Available from Brownells.
Also available is the Sniper Rifle Accessory Kit which includes some other bits and drivers and comes in its own TAB Gear pouch. Available from Triad Tactical.