Interesting. I'm considering doing the same thing. Would installing a shorter barrel make the moderator get in the way of air tank? Also, sounds like 700 version has a 75 cc plenum (which is supposedly better for slugs), whilst the 550 version does not.I just got the same gun from Tony with the 700mm barrel. It put the 25.4s in the same hole at both 25 and 50 yards at the range. I switched over to JSB KOs in the same weight and it was shooting better than me at 100 yards. For grins, I put some 18.1g pellets in it and whoa did the speed go up as well as the sound - all over 1000fps. I have the 25.4s at about 960, but I have the unchoked barrel. I'm ordering the 550mm barrel to swap out so I'm watching this thread closely!
