This barrel is a 2 piece barrel. The front part is aluminum and the back is stainless steel. There are different bore sizers that will work with different sizes of paint. It is available for Cockers, Shockers, Bushmasters, and Angels in 12 or 14 inch.
The On Target Products G1 Barrel is older, so while it may be available used and in a few cases new, it is not commonly available anymore.
This barrel is easily one of the most accurate barrels on the market. i work in a proshop and i have to fix peoples guns all the time which includes firing them to check if it works. i shot the g-1 at a target 25 yards away with team colors paint and hit the target with a grouping of 6 inches. i went out and bought one for my micromag and bushmaster lcd. these barrels are very similar in accuracy and range as a dye boomstick or titanium. it isnt very quiet but then again if you play tournaments they know where you are anyways. range is excellent when shooting out of a low pressure gun and closed bolt guns. and at a price of less than 70 bux, it is well worth the price.
the aforementioned about the noise. it isnt really loud but its definately not silent
Overall it is the best barrel when you consider performance and cost. accuracy is only surpassed by a g-2 or g-3. it is a medium bore barrel and should be used with pmi 32 or diablo paint.
2k cocker w/ 14 in boomstick, 68 ci nitro duck w/ dropforward, 12v rev w/ xboard, shocktech superfly bolt
accurate, almost as good as a bomstick(but not quite), real quiet(not that helps all that much), the ball sizers supposedly help the accuracy with different paint
the price at my local store is $115, the ball sizers seem too short to make any difference but hey what do i know
i like the boomstick better and considering that they are almost the same price i would spend $5 extra and get the boomstick, the ball sizers seem like a trick to get more people buying the barrel but they might really work so whatever, if theres a cheap one you find go ahead and buy it otherwise get a boomstick