I just wanted to pitch in my own idea for this, as most suggestions I've seen for this don't actually help with crowd controlling (as the name of the weapon suggests that it does) and/or have a bit too many stats on it.

Pros:
+15% blast radius
+10% blast knockback

Cons:
20% damage penalty
15% reload speed penalty
-50% stickies out

I feel as if this weapon should be a good weapon for MvM by having stats that can be easily upgraded to negate, but still be useful in PvP, of course. It also has a bit of Sticky Jumper in there, allowing a Demo to cross more distance with less health loss, but only if they are willing to lose a little bit of firepower.

If you have any suggestions to improve these stats, then please comment!