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Posted: 12/16/2014 10:56:50 PM EDT
so i just finished a new WOA DCM match barrel upper i was making into for a SPR... knowing they the head spaced these to .002 or less, i know most coated bolts work work with them, i thought i had at least 1 non coated on my other 3 AR i could use with it..
turns out i didnt... 1 chrome, 2 np3... but i figured i would try anyway... well the bolt never even made it into to the extension... so im thinking...hmmmmm... no way its that tight... so i pull the chrome bolt apart and just drop in the bolt head... fits fine... drop in just the carrier.. stopped dead and stuck on the gas tube...  all 3 carriers are the same... so i pull out the gas tube and its to big to fit in any of the gas keys..  a dremel off the thickness a tad at a time till it fits, polish it up, then put it back in the gun.. good to go...
tube was from a local big AR parts dealer at the gun show... buy stuff from him all the time,,, some odd shit,,, |
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Posted: 12/16/2014 11:16:03 PM EDT
[#1]
be very careful removing material from the gas tube, too much clearance will cause the rifle to short stroke.
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Posted: 12/17/2014 1:16:30 PM EDT
[#2]
Mixed up a 308 tube maybe?
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Posted: 12/17/2014 1:19:03 PM EDT
[#3]
Quote HistoryQuoted:
be very careful removing material from the gas tube, too much clearance will cause the rifle to short stroke. Or just buy a new gas tube. |
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Posted: 12/17/2014 9:49:39 PM EDT
[#4]
Were the carrier keys coated, chomed, or phosphated?
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Posted: 12/17/2014 10:21:09 PM EDT
[#5]
Tony strikes again?
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Posted: 12/18/2014 1:10:54 PM EDT
[#6]
You probably don't have the gas tube fully seated in the gas block. I had a Rainer Arms gas block that had a burr inside it that didn't allow the tube to slide past the gas port. I thought the gas tube pin slipped into place easier than normal. The end result was the same as what you are experiencing. Double check to insure the gas tube is fully inserted inside the gas block. The tight fit on some gas block's gas tube holes creates the illusion that it's properly pinned in place.
I simply ran the right size drill bit inside the gas block to clean up the interior. You may have the wrong length gas tube. They come in rifle length, intermediate, mid-length and carbine. WOA even sells an extended length gas tube for use with their space gun barrels. |
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Posted: 12/18/2014 3:40:55 PM EDT
[#7]
Quote HistoryQuoted: Were the carrier keys coated, chomed, or phosphated? |
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Posted: 12/20/2014 10:50:27 PM EDT
[#8]
Quote HistoryQuoted:
1 of each.... wouldn't fit in any.... Quote HistoryQuoted:
Quoted:
Were the carrier keys coated, chromed, or phosphated? Interesting, I have seen problems with coated carrier keys but never a problem caused by the gas tube. |
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Posted: 12/20/2014 10:53:40 PM EDT
[#9]
Every gas tube I have, and every gas key are slightly different dimensions. I mix and match accordingly. Same for bolt to chamber fit.
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Posted: 12/21/2014 12:33:32 PM EDT
[#10]
Out of spec gas tube. Not surprising. I had one that caused short stroking on my SBR. Replaced it with a better quality one that fit properly and fixed the problem. It happens.
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Posted: 12/21/2014 6:45:41 PM EDT
[#11]
Quoted:
so i just finished a new WOA DCM match barrel upper i was making into for a SPR... knowing they the head spaced these to .002 or less, i know most coated bolts work work with them, i thought i had at least 1 non coated on my other 3 AR i could use with it.. turns out i didnt... 1 chrome, 2 np3... but i figured i would try anyway... well the bolt never even made it into to the extension... so im thinking...hmmmmm... no way its that tight... so i pull the chrome bolt apart and just drop in the bolt head... fits fine... drop in just the carrier.. stopped dead and stuck on the gas tube...
all 3 carriers are the same... so i pull out the gas tube and its to big to fit in any of the gas keys..
a dremel off the thickness a tad at a time till it fits, polish it up, then put it back in the gun.. good to go... tube was from a local big AR parts dealer at the gun show... buy stuff from him all the time,,, some odd shit,,, Seen if a few times where the end of the tube just need to be polished a touch (lathe makes short work of this polishing), but more often, am inner bur ridge at the bottom of the taper entry section of the carrier key that needs to be corrected with a taper reamer instead. As for plated B/C's and there parts, the only question that you have to ask yourself, where the parts produced slightly undersized to begin with so they would be correctly sized after plating, or was just stock parts grabbed and plated instead. Most of the time, it the latter, and the fun one here is the sides of the key have been so over sized with plating, that you end up lapping off the sides of key plating so the key is not binding in the upper receiver track instead (or just lube the piss out of the B/C and let it have it's way with the upper receiver track to widen the track during during break instead). |
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Posted: 12/23/2014 12:06:51 PM EDT
[#12]
I got an out of spec gas tube one time. It was too long and the bolt wouldn't close. I called the business I ordered it from,
they checked iventory. All the ones they checked were too long. |
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