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Pig Tail Gas Tubes

This is a discussion on Pig Tail Gas Tubes within the M16 AR15 forums, part of the Rifle Forum category; particularly on SBRs, Why? Im assuming the gas traveling a longer ways means less recoil impulse, less force on the bolt and less wear and ...


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Old May 5th, 2012, 03:55 PM   #1
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Pig Tail Gas Tubes

particularly on SBRs, Why?

Im assuming the gas traveling a longer ways means less recoil impulse, less force on the bolt and less wear and tear on a short rifles life. Im looking into a 10.5 or 11.5 upper(all NFA rules apply of course) andwas wondering if i should bother as Ive never used a pigtail tube

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Old May 5th, 2012, 04:01 PM   #2
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The pigtail gas tube on SBR was to delay bolt opening. The short barrels with standard gas tubes did not allow the gas pressure to drop in the barrel before operating the bolt. This was a problem during rapid fire or full auto fire. The case would still be locked in th chabmer due to gas pressure and the extractor would rip the extraction grove off of the case. Extracgtor failure was anouther issue.

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Old May 5th, 2012, 06:18 PM   #3
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I built two 7" barreled AR 15s, .223 chambered, with the gas port at the pistol location.
The first barrel came with a pigtail gas tube,
and the second came with a straight gas tube.

I also built two .300 Whisper AR uppers,
again with pistol length gas tubes.

All of these builds were reliable, but then,
I used a full length buffer tube and buffer,
and a HEAVY F/A bolt carrier
.

These options significantly increase functionality with the ultra shorties.
YPMMV
LAZ 1
[;)

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Old May 5th, 2012, 06:40 PM   #4
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Quote:
Originally Posted by Mindfield View Post
particularly on SBRs, Why?

Im assuming the gas traveling a longer ways means less recoil impulse, less force on the bolt and less wear and tear on a short rifles life. Im looking into a 10.5 or 11.5 upper(all NFA rules apply of course) andwas wondering if i should bother as Ive never used a pigtail tube
Don't bother. A carbine-length DI system will do fine. I'd recommend that you start with an H buffer and try out an H2 buffer. Also, ensure that you use a real M16 bolt carrier group.

I've been thinking about picking up a Colt factory SBR (a 6933) or a DD's Mk18. Both are combat proven systems (well, their F/A brothers, anyway).

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Old May 6th, 2012, 07:54 AM   #5
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A factory SBR would be great, but I was thinking at first just getting a quality upper group in 11.5(if I can find one when ready) or a 10.5 which seems more common complete w/ proper bolt etc

My ultimate Goal is actually a true COLT Commando type in Semi but I hear its a PITA to get one from COLT even w/ paperwork as they want only LE Mil having them

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Old May 6th, 2012, 08:42 AM   #6
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BTDT.
In fact,
on my lasr AR, I swapped out my 10.5" barreled upper for an 11.5".


Go with the 11.5".

The one inch longer 11.5" barrel gives a noticeable reduction in MUZZLE BLAST,
with minimal effect on handling or compactness.

I ended up with a LeVang type muzzle accessory to vent ALL the gas forward. Before the LeVang I had a three port Miceluk type compensator which ported much of the gas to the sides, and with the comp it was BRUTAL for Concussion/Blast to anyone standing beside you.

IMHO,
after having played with these UBER short AR 15s in 5.56/.223, they make little practical sense. If you want an EFFECTIVE AR shorty, you would be better off looking for a BIGGER bore version. .300- BLK is ideal for these ultra short applications, even without a muffler. The .300 BLK and other big bore AR 15 alternatives simply utilize the powder more efficiently in shorter barrels giving better burning within the barrel rather than as blast/flash outside the barrel.
YPMMV
LAZ 1
[];)

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Old May 6th, 2012, 09:04 AM   #7
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Quote:
Originally Posted by Mindfield View Post
A factory SBR would be great, but I was thinking at first just getting a quality upper group in 11.5(if I can find one when ready) or a 10.5 which seems more common complete w/ proper bolt etc

My ultimate Goal is actually a true COLT Commando type in Semi but I hear its a PITA to get one from COLT even w/ paperwork as they want only LE Mil having them
I've honestly never heard that...however, if you want one, here's a great place to buy from:

http://clydearmory.com/colt-le6933-11-5.html

$1299.95 and in stock.

Or...

http://clydearmory.com/daniel-defens...-da-07206.html

$1299.95 and in stock.

I bought my Colt LE6920 from them, and their CS rocks.

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Old May 7th, 2012, 01:44 PM   #8
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Quote:
Originally Posted by Lazerus2000 View Post
BTDT.
In fact,
on my lasr AR, I swapped out my 10.5" barreled upper for an 11.5".


Go with the 11.5".

The one inch longer 11.5" barrel gives a noticeable reduction in MUZZLE BLAST,
with minimal effect on handling or compactness.

I ended up with a LeVang type muzzle accessory to vent ALL the gas forward. Before the LeVang I had a three port Miceluk type compensator which ported much of the gas to the sides, and with the comp it was BRUTAL for Concussion/Blast to anyone standing beside you.

IMHO,
after having played with these UBER short AR 15s in 5.56/.223, they make little practical sense. If you want an EFFECTIVE AR shorty, you would be better off looking for a BIGGER bore version. .300- BLK is ideal for these ultra short applications, even without a muffler. The .300 BLK and other big bore AR 15 alternatives simply utilize the powder more efficiently in shorter barrels giving better burning within the barrel rather than as blast/flash outside the barrel.
YPMMV
LAZ 1
[];)
I have my heart set on an 11.5, I just want a short loud little carbine for fun mostly because i can LOL I dont have a uber practical use really

Quote:
Originally Posted by ArmyCPT View Post
I've honestly never heard that...however, if you want one, here's a great place to buy from:

http://clydearmory.com/colt-le6933-11-5.html

$1299.95 and in stock.

Or...

http://clydearmory.com/daniel-defens...-da-07206.html

$1299.95 and in stock.

I bought my Colt LE6920 from them, and their CS rocks.
Im glad to know that, seems they have been different since 05 it seems

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