Unit ZER0, on Nov 29 2010, 04:00 PM, said:
The custom barrel I have attached eliminates this altogether. The total barrel length, or distance the dart must travel from breech to muzzle, is approximately 37.5 inches. Couple that to the fact that the air from the main cylinder is forced around the dart as it traverses this distance helps with eliminating fishtail. Earlier versions of my project had shorter barrels, and they did cause the darts to fishtail.
That explanation doesn't really pan out. I've never experienced or known of an experience whereby a barrel extension that doesn't touch the dart can affect ranges. Cosmetic barrels, like the one in the LSFG, or your "custom barrel", which by all appearances is just a barrel from a LSFG, don't affect ranges. A longer barrel, if tight fitting, allows more air pressure to build up behind the dart before it exits the barrel, thus increasing its velocity, and range, if the length is appropriate for the air output. In my experience with streamlines, this can lead to greater accuracy from even streamlines, the crappiest of darts. I find it radically implausible that your barrel produces any sort of effect.
I would happily change my tune if you could demonstrate, perhaps via video, the performance and accuracy of your gun with as compared to without the barrel.
To elaborate on my earlier statement, I started a project to get as much range and accuracy out of a stock streamline as possible. The end product was 1 foot of 9/16 brass inside 1.5 feet of CPVC, coupler'd to the front of an otherwise stock BBBB tank. Darts would exit the barrel faster than the eye could follow and travel between 50 and 60 feet before fishtailing, up to a wildly unpredictable possible max of over 100 feet level (there is actually a ~150 foot straight hallway in the basement of my apartment building, this is an indoor test). You had to twist in a dart to get it rearloaded into the barrel, it was a wildly impractical and dangerous proof of concept that I don't recommended anyone recreate. I called it The Murdercannon after it left a welt the size of a quarter on a friend's back for 48 hours from 30 ft. I never used it in a war.
This was the culmination of about a month's trial and error with barrel length and material. Perhaps now you understand why I am so skeptical that a longshot with plastic bits glued on has achieved the same result of 60' of accuracy with stock streamlines.