Just curious... but how is he going to lug the ammo for it too? Each power-cell for it will weigh 5kg, which is enough for 6 bursts only. That, and wouldn't he have to get it modified to accept a power cell first, given that vehicle-based las-weapons get their power from generators and the like?

The character in question is a Mechanicus Secutor and he spent some serious downtime at the end of the last adventure repairing the weapon and attaching it to the same type of power pack for the MP lascannon. This was helped by the fact that they are currently in the Lathes and he managed to convince several of his tech-priest brothers the help him by some fairly impressive role-play and a few very-hard/hard tests. Its not exactly a perfect idea, but it was that or leave functioning tech to be overrun by tech-witches. He also grabbed any other tech he could salvage in time and almost ended up getting killed in doing so. He did lose both battle servitors that he had been given for the mission.