The optimal size for paintball barrels is roughly 10-14 inches. Anything less tends to release the ball before it has a chance to accelerate. Anything more can use up too much gas, cause inaccuracy if not held completely still. A good "sniper" could use a 16-18 inch barrel, but ONLY if it is held still, with a bi-pod, in the prone position. Trying to run around with a long barrel (16-21 inches) is not only difficult to maneuver, but is actually less accurate when moving, or standing and shooting.
Chat with our AI personalities
If you are looking for one of the best 20 inch barrels, it would recommend a 20 in deathstix. I assume you are using this for woodsball, and it comes in a great looking camouflage coloring. It is made by a company based in Australia, though they are not very well known. Though something to consider is that studies have shown that a 14-16 in barrel is far superior to anything longer or shorter. Really when you purchase a 20 in barrel all your getting is an extra 6-8 in and the higher risks of breaking your barrel in a slide.