The Powers C4-LT Trak-It has a larger combustion chamber and a modified valve design to provide a slightly more powerful charge for firing 2 9/16 pins through 2x4s into concrete and steel base materials. The C4-LT has a 42-pin magazine capacity and utilizes a pezio to fire the tool without creating a spark. The Powers TI-C battery clikcs onto the back handle and averages 5,700 shots.