Has anyone switched out barrels from a MK3 . 25 500mm to a . 25 700mm? I think I am going to do this soon and while am at it add a 910 power plemum, and extend the air tube. I have already installed the dual port. Any tips would be appreciated. I want to shoot Hades, the hybrid slugs and predator poly mags. I am thinking I sould be able to tune for this pretty easy. Thanks for the help!
