I dont know were you have research this but it's wrong.
If you hit a target let's say 10cm X 10cm at 80 feets with a stock inner barrel at 247mm you get a grouping of 10X10.
By replacing it with a tight bore (6.04) you will hit the same target at a much smaller grouping lets say 4X4cm
So at 100 feets you now have a grouping of 10X10
So in total you gain 20 feet of range and improove your accuracy.
Theses numbers are just to show you how it works.
So going to a 363 mm inner barrel sill do the same but in it's stock form it still got more range. So does a 510 mm inner Barrel.
Up grading ths hop up sleeve is the thing you have to do. Get yourself a nice promoteus blue/purple soft type. This will be the combo so you will see the big difference.
Adding a twist barrel will give you moore accuracy by getting the same trajectory on the BB's each time (at least that'S what i get from my part)
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