Required items:
Scravenger
Chopstock
Chainsaw attachment (optional)
Your blaster should look like this, adjustment for the chopstock doesn't really matter and it's upside down lol (i prefer fully collapsed)
Or like this if you want the chainsaw
Ok now you need to follow these steps
Turn on slamfire mode.
Hold the blaster with one hand
Lurch the blaster forward to strike your target with the chainsaw (skip this step if you don't use the chainsaw)
Spin the blaster, and hit your target with the chopstock's back end
Return the blaster to step 2, the blaster should slamfire.
And there you go, you have just finished off your target in the coolest way possible.