According to the guy I spoke to at KT the other day, KT is not going to upgrade current rifles. The reason?? It is difficult to remove the SU barrel and could possibly ruin a rifle which they would then need to replace. I was very bummed out last week about this. Any KT people reading this that have a different opinion on whether this can be done? I would really really really like to have my barrel changed to the short version and/ or the Comped version. I also wanted to have my color changed but that was a no go too.Flyer said:The new version of the SU will offer a muzzle-break option. I'm don't know if it'll be possible for sure, but I'd think you could have it fitted to your present rifle at the factory when they become available.