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Posted: 1/23/2006 8:19:58 PM EDT
I installed a ff 4 rail handguard and everything went fine (well, eventually
 0 and then i put back the bolt carrier and noticed the key was clicking the gas tube- the gas tube was slightly off center. i thought about what this would mean to the tube and the carrier everytime it cycled. Anyway, i disassembled and played with it till it was as straight and centered as possible and until the gastube touched the key as little as possible upon entering it. My question is this.... Is there a better way to do this besides eyeing it or carefully fiddling with it till everything seems kosher? Thank you in advance. |
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Posted: 1/25/2006 2:16:02 PM EDT
[#1]
no one?
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Posted: 1/25/2006 2:38:39 PM EDT
[#2]
I had the exact same problem. the way i did it was i used a screwdriver to adjust it side to side while watching the tube in the space between the front of the receiver and the hg until i got the side to side motion eliminated when i cycled the bolt, then i used a piece of string hooked around the tube and wrapped around the shaft of a big screwdriver and did the same for thte up and down.
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Posted: 1/25/2006 2:50:23 PM EDT
[#3]
You should also check it after you've fired some rounds thru the gun rapidly, to see how the fit of tube to gas key is when hot.
Heat can induce warping of the tube, caused by stress risers in the tube itself that are created during manufacturing, and also maybe created when you bent it. Ensure that it is a good sliding fit when it is cold, and also when it is heated up. |
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Posted: 1/26/2006 8:53:40 PM EDT
[#4]
kurt, twl, thank you.
When i noticed the prob, i took off the FSB and gas tube and ever so slightly bent it to fit. But i still have yet to take it to the range. |
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Posted: 1/27/2006 1:11:42 PM EDT
[#5]
The gas tube should freefloat (when no bolt carrier is present) with the only contact with the rifle being the FSB. I just adjust my barrel nut to where it does not touch the gas tube. Are you sure that your gas tube isn't being deflected to one side by the barrel nut?
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Posted: 1/29/2006 11:52:59 PM EDT
[#6]
Thanks for the info about the free float necessity. I gotta check it all out this wednesday. |
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Posted: 2/4/2006 6:42:59 PM EDT
[#7]
Also grip the FSB and hold your reciever ,does it wiggle?
Your barrel nut may not be tightned enough!!And the spokes on the nut touching the tube!! Bob 
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