From what I've read, that certain point isn't very long either (around 450mm I think)- correct me if I'm wrong.
@0326reconman: Switching the barrel length to 450mm won't make nearly as much of a difference in the performance of your rifle as hop-up mods and quality of parts will. I wouldn't worry about changing the length unless you really wanted to. I'd focus more on the hop-up mods and such that you originally listed and what were recommended, as those are what will really add range and accuracy to your rifle.
@0326reconman: Switching the barrel length to 450mm won't make nearly as much of a difference in the performance of your rifle as hop-up mods and quality of parts will. I wouldn't worry about changing the length unless you really wanted to. I'd focus more on the hop-up mods and such that you originally listed and what were recommended, as those are what will really add range and accuracy to your rifle.