Bolt 6.00mm "ultra tight bore"

[Fubujubu]

Anybody ever use one of these yet?
Had one givin to me to test out in my Striker. Currently using a dual bore edgi but going to see how they stack up to each other. Tried to look for reviews but havent really found much on the Bolt barrels.

[ThunderCactus]

tighter bores are designed entirely, solely, and very specifically for raising fps, but are almost always marketed as somehow magically increasing range and/or accuracy, because evidently the people who make upgrades for airsoft guns don't even know how they work.

If you've got low air volume like on an APS2 bolt action or an AEP, or a short GBB like a pistol, then a tightbore will help get better muzzle energy, which in turn can net better range with heavier BBs.
If you're shooting more than 200 rounds in a game, like on an AEG, the 6.00 is just going to cause issues with jamming as it fouls.