So in the last big major weapons patch, the Punch Gun was given two bullets, making it seem like the spiritual predecessor to the Magnus line instead of a strange standalone gun with 1 bullet.
While messing around with it, I noticed Punch Gun also knocked monsters back at least 1 full tile!
I tested Callahan and found no such knockback.
During the free-elevator fun, I created an Iron Slug in anticipation for the next weapon updates. I confirmed (since Punch Gun is normal, like the Iron Slug), it does not have any knockback, except for the charge.
I propose Punch Gun's knockback be fitted to the Magnus Line guns. If not the entire line, then the Iron Slug.
So, how about it? The knockback would definitely help balance out the fact that you stand in place while shooting the gun, and I'd almost welcome that over an actual damage boost, which that line feels also like it needs.
If you were to, then the Callahan would get about 1.5 to 2 squares, and the Iron slug would get 3-5 squares per hit. The slug is supposed to be a massive BLAM anyways.