New Ultralight Arms Light Mountain Rifle in 30-06 Springfield. Forbes' Light Mountain Rifle in 30-06 is the long-action version of the ultralight concept — an action sized for the 30-06's 2.494-inch OAL in a rifle that weighs under 5.5 pounds complete. For mountain hunters who grew up on the 30-06 and see no reason to change cartridges, the Light Mountain Rifle offers the same performance in dramatically reduced carry weight. Type: Rifle Action: Bolt-Action Caliber: 30-06 Springfield Capacity: 1 Year introduced: 2005, USA Weight: 53 oz Overall length: 42" Status: Active Intended use: hunting, mountain hunting