So I was looking at items in the armoury for future use on my characters in SFS. Finding this "weapon" really sparked an idea in my head for a Mechanic. From my experience with bots while playing and GMing I never feel impressed. Instead of focusing on doing damage I had the thought of making it a helper bot. Sure it cost 1300 credits but it would be great to have it fulfill a support role.
There are a few problems though that I see with how this item is written. It is not very clear whether or not you need to roll to hit with this "weapon." I would rule at my tables if this ever appeared that you do not need to do so. The 1d4 temporary hit points is not going to be a game breaking reduction in damage. For those that build their characters to not take damage by using damage reduction this is simply a little extra on top. These 1d4 temporary hit points only last until the start of my next turn too, it is not a prolonged condition.
My other problem with the "weapon" is how it is affected by overcharge and weapon specialization. If I overclock using overcharge it will only drain extra charges? Adding another 1d6 at the cost of 12 charges, essentially three shots from the max ten(40/4 usage) is not exactly game breaking either. The least this adds is 2 temporary hit points, at most 10. On average it would stop 3.5 and 2.5, rounding down to 5. The amount of damage that gets tossed around as you level up certainly out paces this.
Add in weapon specialization and you really only add half your level since it is a small arm. This aspect is harder to argue since the feat specifically mentions damage. The overcharge I would consider easier to explain away. Being a tech level 4 item the earliest you can purchase it is level 3. So Your average only moves to 7, and goes up by one every even level. True the amount of this would stop wouldn't be huge but it could mean the difference of a team mate falling in battle.
The next upgrade for this item is at 8th level since the Defender is tech level 9. This version provides 2d6 temporary hit points and cost 13,800 credits. This is not a cheap way to provide support at either version. Maybe this is just me rattling a saber for a futile cause...But I would love a rules clarification on this item or a possible official ruling I can point to when questioned about its use.