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Posted: 4/15/2007 6:11:28 AM EDT
[Last Edit: 4/15/2007 6:16:31 AM EDT by TravisM1]
I believe I've got a sealing problem between a barrel and its gas block.
Its a 16" heavy barrel, and the gas block is one of those 4-rail types that clamps around the barrel, using two screws to tighten a split on the underside.
I've painted the barrel with Aluma-hide, and there are abrasions along the top of the barrel in front of and behind the gas block.
Upon removal of the gas block from the barrel, I've found some carbon deposits corresponding with the areas where the barrels finish has been scuffed.

My question is, how do you seal this area up? Would a different style of gas block be better? The OD of the barrel in the area the gas tube rides is a consistent .934". Should the block need to be forced onto its seating area before using fastenters, or what?

FWIW, the rifle has the correct buffer and spring for the extension, the gas key is staked and tight, and the gas rings are good.
Link Posted: 4/15/2007 12:24:31 PM EDT
Link Posted: 4/15/2007 2:16:42 PM EDT
We did not paint the gas block area.

I'll try tightening the screws more. Thanks.
Link Posted: 4/15/2007 5:52:36 PM EDT
Link Posted: 4/16/2007 5:06:42 AM EDT
I'd say the gas port in the barrel is rouughly in the center of the burn marks. The inside-top of the gas block also shows burn marks.

The hole in the gas tube is lined up with the hole in the gas block.
Link Posted: 4/17/2007 12:18:22 AM EDT
I have a similar problem with a PRI set screw gas block. I get short strokes due to the lack of pressure. I have since ordered a LaRue to replace the PRI.
Link Posted: 4/19/2007 12:46:56 PM EDT
What is wrong with the PRI gas block?
Link Posted: 4/19/2007 12:51:55 PM EDT
Leaking too much gas it seems. I'll be able to tell better when the other gas block is installed.
Link Posted: 4/20/2007 7:09:00 PM EDT
The LaRue gas block was the answer! Works great!
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