Originally Posted by ThunderCactus
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....
Oh I know, but I was just saying that too tight of a tightbore like 6.01 jams form much easier, since there is less "space" so to speak for error.