Oh, the DC-17m pack? That was the type of blaster that Republic Commandos used. It's actually three weapons in one. You can attach the standard attachment to the blaster, and it will fire like a regular assault rifle. Then, you can attach a sniper attachment to it, and the DC-17 will have a scope and enhanced targeting for sniping. Lastly, you can attach an anti-armor attachment to the blaster, which is basically turning the DC-17 into a grenade launcher.