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the size of barrel has two things:
1. where the air window should be places inside your gearbox for maximum performance
2. how much stuff you want to attach to it.
Aside from these points, there is not difference in terms of performance.
When it comes to CQB, I opt for 416 or MP5 as smaller size allow for very good manuver around corner. I have not played outdoor and I am not a sniper.
The best idea is to go to store and hold the actual gun. If you go out to play, ask people about the piece and see if they allow you to hold it for testing.
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