Originally Posted by Twin#1[Op-for]
How so? I was under the impression the FPS increase was because less air escapes around the BB, but rather stays behind in since the diameter is close to the BB itself. You are right about the jamming though, since any dirt or impurity of a BB would change its size, being TOO tight will cause jams.
The BB never touches the wall of the barrel, if it does, it causes extremely inconsistent accuracy and frequent jamming.
Going to a 6.03 increases fps by 10-15
Going to a 6.01 increases fps by 15-20
As was stated, the best solution is the simplest one; get a different spring.
And in case anyone was thinking it, using heavier BB's doesn't reduce your fps..... good to throw that one out there every now and then....