It is a one piece, 14” barrel (from threaded tip to back of breech) so, it's a little bit shorter than the stock two-piece Tiberius T9.1 barrel. It also comes with detents pre-isntalled. It appears to have been made to LAPCO standards as all of the groove edges have been radiused (unlike the stock) and, the anno matches in feel and appearance to the LAPCO dust black barrels (which are Type III). The barrel does not include the o-ring found on the forward portion of the Tiberius front (I think it's there to help hold the barrel in, or stabilize it. The front threading is Tiberius Style (personally, I prefer LAPCO's style, even though they are semi-compatible).
What about the rifling?
They used a traditional rifling style with 12 peaks, that twist at what looks to be 90degs clockwise, over the length of the rifling (13”), for a twist rate of 1 turn in 52”. There appear to be more surface area taken up by the peaks than the valley. Unforutnately I found it very difficult to get a good, repeatable measurement for the peaks and valleys with my digital caliper. I expect that the diameter from peak to opposing peak is .683.
Can FS rounds go through the barrel?
I put a First Strike into the breech and, as most expect, it took a bit more force (than the stock 9.1 barrel) to get it through the barrel. I normally use the long piece of a plastic coat hanger for this but, it felt like I was going to break the back wall of the round. So, I wrapped it with a bunch of electrical tape (to spread the force) and, I was able to push it through with no damage to the fins, back wall, or nose.
Does the rifling twist the rounds?
Coloring one half of an FS round, I was able to push it through and observe the round rotating 90deg so, the rifling does appear to succeed in rotating the round in the barrel. I cannot confirm this in firing conditions though.
(colored area now on bottom)
Will the rifling destroy the rounds or damage the fins/skirt?
Firing 8 rounds into my super scientific capture rig without chronoing, I got the following results:
One round made it with no damage at all
One round delivered it's payload (the nose broke completely) but had no damage to the skirt
Six rounds suffered hairline fractures in the skirt (one of which didn't deliver it's payload)
Is it more Accurate?
I can't answer this one (no indoor field for testing).
Anyone who's shot a significant number of First Strike rounds and then cleaned their barrel, can tell you of a flaky gray residue left in the barrel by the rounds. The rifling may accelerate this and over time, it may impact the barrel's performance or efficiency (I can't say for certain without rigorous testing)
Overall, I like it, it appears to do what it promises (mechanically). I'll have to wait until rigorous testing to say how well it does what it's supposed to (increased range and accuracy).
15 JUN 2011 UPDATE: As some of you know, I fired 420 rounds through this barrel at Living Legends 4. During this time, I never felt disappointed with the accuracy, and simply found myself wishing I had taken the time to work out the click elevations for the adjustable riser.
You know that gray residue issue I mentioned above? Well, it reared it's ugly head twice during the event- once on Saturday, and again on Sunday. Each time, it was after a significant amount of rounds had been fired (in excess of 100).
The symptom: The round fails to leave the barrel and, the round becomes jammed 1/2-3/4 of the way down (even with a full air tank). You cannot push it through with a swab, and further shooting compounds the problem. When this happened I found I had to use a 5/8" dowel to push the round through. The 'pusher' has to be wide enough to push the round by the fins because if you push by the back wall, it will collapse and then you will push through the round, leaving the skirt and the remaining nose, stuck in the barrel.
I have found that the best way to prevent this issue is to clean the barrel after every every 100 shots or so. I practiced that this last weekend as I fired about 100rds in ranged test firing, cleaned my barrel during a break, and then fired about another 80rds in game play. The problem didn't re-occur at all.
Edited by UV Halo, 15 June 2011 - 10:39 PM.