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Posted: 1/21/2006 2:31:56 AM EDT
[#1]
Gawd..26 views and no answer..guess that those pigtails are not in use by anyone..damn..
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Posted: 1/22/2006 3:44:22 AM EDT
[#2]
Sorry partner, most of us here use straight gas tubes. Out of curiosity, what's the purpose of a pig tail anyway? Is it to cool the gases and decrease the volume and therefore pressure of the gases?
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Posted: 1/22/2006 10:32:06 AM EDT
[#3]
Yeah, the reason for a pigtail is to have a longer gastube in a short barrel, therefore slowing down the pressure curve and allowing for a slower recoil impulse.
My pigtail gastube BTW is 45cm long (16inches and somewhat). |
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Posted: 1/22/2006 2:21:05 PM EDT
[#4]
Anthony-
I just noticed the IM and I am responding here... I have never installed a pigtail gas tube. I always develop the gas port to the proper diameter so that the gas impulse is correct with a straight tube. If I were in your sutuation, I would install the gas tube into the gas block first. Then remove the barrel from the receiver and fit the gas block/tube to the barrel. You can use the gas block as leverage to twist the tube around as necessary until you have the spirals basically centered around the barrel. Then pull the gas block/tube back off the barrel and re-install the barrel to the receiver with the barrel nut. I notice that you have a YHM barrel nut. Was this installed on the receiver with the old gas tube? If it's new, you may need to enlarge the top hole about 1/2 way down so that you have more room for the bent part of the gas tube as it comes around to straighten out into the gas key on the bolt carrier. Now you should start to work the gas tube back into the receiver. You will want the bolt carrier in place to help straighten the gas tube as it goes in. Work slowly, lots of small tweaking so you don't over-bend the tube as you get it into place. Good luck 
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Posted: 1/23/2006 5:54:30 AM EDT
[#5]
Thank you so much for advice, Randall.
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Posted: 1/23/2006 11:21:53 PM EDT
[#6]
This is the most time consuming task I've ever done on a weapon, and I've tweaked more than one..
However, surfing the net searching for inputs, I've learned something about tube bending: particularly one bending machine caught my attention:  The wheel on the machine was like a giant steel pulley, and, given the fact that I was into modelcraft and miniatures in my youth, give me food for tought.. I acquired from a hardware store some small pulleys (you know the ones your mom use for drying clothes hanged on a wire on summer), a brass one and another two made of hard lexan..I used the padded jaws of my vise in order to have leverage, and the pulley (that has an inside diameter almost identical to the OD of the gastube) to form CAUTIOUSLY a bend.  I used the brass (larger) pulley to bend the back end of the tube and the small one for the front: Now the tube is slowly fitting perfectly, almost done..the thing now that is driving me nuts is that the metal guard that cometh with the original pigtail is not fitting... Damn, that pigtail thing is becoming THE HOLY QUEST OF THE UNDERDOG AGAINST A PIGTAIL GASTUBE...hehehe.. Back to top |
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