Hellboy Samaritan barrel split reworked and fixed

Tried printing the original JersyBeast's excellent Good Samaritan prop, http://www.thingiverse.com/thing:582501
But too much support ruined the barrel. So, I found sirfrog's barrel split and tried that instead.
https://www.thingiverse.com/thing:1828293
Unfortunately, the upper barrel wasn't good, due to some messed up geometry in the rifling, and a few other places. You can see it in the pictures.
Rebuilt the inside of the barrel entirely, and the breach facing end, and cleaned up the other parts for good measure.
I've included my Sketchup files, if anyone wants to mess with it any further.
Along with better results, this also printed much quicker on my printer.