Very Blanchitsu. I've never had the guts to dirty up my models this much, but these look great. My tip would be that when painting (or drilling) the gun barrel, the hole should share the size of the bullet, so at 20:40, the gun barrel on the autopistol would realistically be much smaller.
Tyvm :) The gun barrels are a fair point, kinda just thought it was a bit of pipe/a rattle can that had been attached to the body of the gun lol. As for trying it your self, why not get either some spare minis, or buy a few specifically to test this out? That way if they don't come out as planed no harm. Another option would be get/make some terrain to test it out on :)
The humble Iwata Eclipse, the GOAT utility airbrush. Frustrating that i spent so much on different, twitchy, fancy brushes before picking up the eclipse. Honestly, the brush is super forgiving for beginners, and as you improve, is as capable as you need it to be.