Browning’s classic gas-operated, autoloading BAR with a safari-style profile. The engraved forged steel receiver is accented with scroll engraving and is drilled and tapped for scope mounts. The gloss-finish, select walnut stock and forearm feature generous diamond-pattern cut checkering and a recoil pad. 22" barrel. Multilug rotary bolt. Detachable box-style magazine.
Browning® BAR Realtree AP™ Rifle, Item: IK-211106, the 9 oz weight difference is in the 2 inches of barrel length and taper and the in the receiver since the 30-06 is a long action rifle and the .308 is a short action.
I have not seen one on the website. The clip releases downward on a hinge. It is not that easy to just pull it off and insert another one. You would have to attach it to the hinge and swing it up. It's wouldn't be as quick as other designs. It does hold 4 in the clip and one in the chamber so I don't think you would need a quick change for most hunting scenarios.