Good afternoon,
Our element 4.0 and Envy Pro both have an integrated 1.5-inch RRS dovetail (arca swiss) that is machined into the chassis. The arca rail runs the full length of the forend on both chassis. Our Element 4.0 Magnesium is a lightweight chassis that can be configured to weigh as little as 28 oz. It is also ambidextrous so your left-handed T3 should drip right in! Give us a call or shoot us an email and we can discuss what the best fit for you is going to be! 970-241-1807