Then I'll try one of these wide bores and see if it's true.I have been working on ball bearing and marble accuracy and preliminary tests suggest blowby improves accuracy with hard spherical projectiles in hard barrels. I was surprised.
I'm almost certain a straight barrel with no hop up would be more consistent down range, but for airsoft BB the drop would be very significant. I have read that too, however the articule is rather old and many new things came up. The old airguns I made with ~6mm ID aluminum extrusion tubes were very accurate, however I never attempt long shots because the bb drop. In order to have the same range the FPS needed would be seriously unsafe.My general opinion is that while a hop-up system makes airsoft playable in terms of handguns and assault rifles, there are too many variables in the way the spin is imparted for it to lead to meaningful accuracy at long range. Apart from that, inducing the spin robs the BB of energy that reduces its impact even if it does manage to connect with the target. The ultimate sniper system would combine accurate range estimation along with appropriate drop compensation.
The Airsoft Trajectory Project is also an interesting link.
I think I'll cook up that rig I mentioned above to test out, once the mid-terms are over.
"yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " 
