Ok, you all know what one is, so I won't go into specifics describing it. But using the Vibro-bayonet as good starter attachment, and comparing it to the base stats of a Vibro-Ax, how would anyone here stat one? I mean, literally breaking the head off a Vibro-Ax and McGuyvering it to attach it to a KS-23, for example?

I based my Mon Cal mechanic on Mac, yup he even has a shotgun-axe: the Mon Cal balster spear from Strongholds.
http://swsheets.com/c/amzwqqome-kordan

I'd tell a PC drop the Pierce on the bayonet, give it Vicious 2 and Sunder and call it done.

20 minutes ago, 2P51 said:

I'd tell a PC drop the Pierce on the bayonet, give it Vicious 2 and Sunder and call it done.

Perhaps a little more Cumbersome?

Just buy both weapons add in a Hard Mechanics check and i guess the ability to run out of power and build it this way (please excuse poorly done MS Paint)

You can then swing it just like a normal axe (assuming super space tech cold burning gun powder) and you can use the shot gun part safely because you have the axe head tucked under your arm and your bracing with the stock

Early concept.

Fully conceived concept.

1 hour ago, 2P51 said:

I'd tell a PC drop the Pierce on the bayonet, give it Vicious 2 and Sunder and call it done.

Interesting, but keep the damage at +3? I was gonna borrow from the crafting rules and drop damage to +2 due to losing the 2-handed shaft for swinging. Thus dropping enc to 2, take 2 hp as I figure it's about the size as an under-barrel weapon, not as compact as the bayonet.

I had a completely different image in my head.

28 minutes ago, Randy G said:

Interesting, but keep the damage at +3? I was gonna borrow from the crafting rules and drop damage to +2 due to losing the 2-handed shaft for swinging. Thus dropping enc to 2, take 2 hp as I figure it's about the size as an under-barrel weapon, not as compact as the bayonet.

No, keep it as a bayonet damage, no +3, base +1. Invariably any multi tool sacrifices capability for utility.

I would add a setback when using he axe in melee and perhaps +1 cumbersome when using it in either mode.

+2 damage if you utter the following line the first time its used...

"Hello, I'd like to AXE you a question, does this Shotgun make my arse look fat?"

(Sorry, can't help myself...!)

10 minutes ago, Sturn said:

I would add a setback when using he axe in melee and perhaps +1 cumbersome when using it in either mode.

The bayonet already has Inaccurate 1, and adds Inaccurate 1 to the weapon it is attached to. But I like the +1 to Cumbersome.

2 hours ago, kaosoe said:

I had a completely different image in my head.