Trollkin Champions Assembly

I managed to get my Trollkin Champions assembled as well. These guys were a lot faster since they didn't require pinning but I am stumped about one thing. The models come with these 5 little barrel pieces and I cannot for the life of me figure out where they are supposed to attach to the models. If anyone knows, please fill me in as I have been unable to find any pictures online that show the location.

Here are the barrels I'm talking about:

From Trollkin Champions 1

Now for the models themselves, these guys are really cool looking. Lots of detail. So far I've been EXTREMELY impressed with the quality and level of detail on Privateer Press models. The only thing I'd ask for is a little more variety would be nice. There seems to be only two grunt bodies and one leader body and it would be nice if there was a way to make all five guys in the unit look unique.

Leader:

From Trollkin Champions 1

Grunt 1:

From Trollkin Champions 1

Grunt 2:

From Trollkin Champions 1

Grunt 3:

From Trollkin Champions 1

Grunt 4:

From Trollkin Champions 1