It looks like Tim @ Mac1 charges $25 for a power prep,and $25 for an accuracy prep,over the base cost of the gun....not bad.However,like you I was looking at just the 2300kt with 10 barrel,and long breech.I could be wrong,but it doesn't appear as if Tim offers the steel breech,and longer barrel.So being that's what I'm looking for,ordering direct from Crosman seems to be a better deal initially.I know people that have had their guns worked on by Tim,and he does GREAT work,and I wouldn't hesitate to have my gun worked on at a later date,after the initial purchase.