Anyone here try those pig-tail gas tubes?

[Bug Splat]

Was flipping through a Brownells catalog the other night and saw it. Claims to slow the cycle rate of a carbine to a rifle length system. Not really interested in trying it as my setups run fine but it just poked my curiosity.

[ar15barrels]

They also distort as they heat up, causing gas tube alignment problems.

Two thumbs down.

[Hunter4life1990]

would a gas tube with the same outer diameter but with a smaller inside diameter achieve the same result?

[aplinker]

would a gas tube with the same outer diameter but with a smaller inside diameter achieve the same result?

No. If anything it would do the opposite (expansion in gas tube slows rate).

[Group B]

What about the Tim La France twin-tube gas tubes:

http://www.nait.com/LAFRANCE/gas.html

[technique]

What about the Tim La France twin-tube gas tubes:

http://www.nait.com/LAFRANCE/gas.html

used one in my pistol...worked great.

[gasol1ne]

those pig tail gas tubes are all the rage in the philippines. i remember a gunsmith telling me that he cuts a 20 inch barrel down, he needed to use pig tail gas tubes so that the rifle will fire in full-auto reliably.

[Lateralus]

I like the idea. Too bad I just use a rifle length tube/heavy as hell buffer in my Carbine. I wonder if there are any other shapes that might work better....

Randall: Assuming they don't distort (From your experience though, it sounds inevitable), is the result noticeable?

[ar15barrels]

PRI sells a "fatboy" gas tube that's been hydraulically expanded to increase the volume.
This lowers pressure at the bolt carrier which helps the carbine gas system.

[reidnez]

PRI sells a "fatboy" gas tube that's been hydraulically expanded to increase the volume.
This lowers pressure at the bolt carrier which helps the carbine gas system.

Now that, to me, sounds much more like sound engineering. Any benefit to using that in tandem with a heavier buffer, or would that push the pendulum too far and cause issues?

It seems to me that you could design a gas tube with a widened expansion chamber somewhere along its length, but otherwise normal, and that would have approximately the same effect as all these designs...increase the internal volume of the tube, reduce the pressure that hits the BCG. There are lots of possibilities. But the simplest is probably to increase the diameter of the whole tube slightly.

[The DRis]

Or, if it ain't broke don't fix it.

[Bug Splat]

Good info guys. Thanks for filling me in.

[NewGunner]

I found this thread interesting. What about an expansion chamber type of thing. If anyone is familiar with four stroke motors (specifically motocross applications) something like the new trend to put small can expansion chambers in the exhaust tubing (similar to those used in 2strokes but much smaller think FMF powerbomb). Something like the increased inner diameter but not... Anyone?? Maybe I should get something going. And actually the looped one reminds me of the new yamaha exhaust design.

[ar15barrels]

Any benefit to using that in tandem with a heavier buffer, or would that push the pendulum too far and cause issues?

It's a case-by-case basis.