AR Gas Blocks

ThePunisher

ThePunisher

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Belleville/Kingston Ontario
I seem to be having issues getting a good gas block. I have a Double Star railed gas block that attaches with set screws - 2 on the bottom, and one on the top. After I installed it the first time, I noticed the screws were loose after firing about 500 rounds. I retightened them, but one was already stripped:redface:. I tightened the other 2 as much as I dared, and after another 200 rounds, the bloody things are loose again! The biggest pain in the ass with this gas block is getting it off...even though the screws are loose, the gas block will only move ahead about 1 inch, and then you have to tap it off with a rubber mallet (tapping actually doesn't work, you really do have to hit it). It seems the set screws cause burrs, which then get hung up on the gas block...:mad:.
Another member here has gratiously offered to repair this unpleasent gas block, but I was wondering if the other type of gas block is better - like the Vulcan Arms one that Brownell sells - instead of set screws, it uses 3 bolts that go through the bottom sides and clamps the block to the barrel. I need the rail on the front so I can mount a front sight; otherwise, I would go with the Vltor low profile gas block. Should I try and make this thing work, or just go with a different gas block?
 
You should be using loctite on any set screws like this on your rifles. It'll help them from backing out like you're experiencing.
 
ThePunisher said:
Should I try and make this thing work, or just go with a different gas block?
Click to expand...

Set screws are inherently inferior, as you have discovered. There's a reason why motorcycle fork tubes are held in by pinch-clamp type clamps instead of set screws.

Locktite doesn't like the temperature of a gas block / barrel and will work poorly.

Pinch-clamp style gas blocks are the next best thing to taper-pinned.

The one you identified uses this clamping technique; other than that, I don't know anything about it. Another option is the JP - everything they make is top-notch:
http://www.brownells.com/.aspx/sid=61247/sku/Standard_Gas_Block__Black_Stainless
 
acrashb said:
Set screws are inherently inferior, as you have discovered. There's a reason why motorcycle fork tubes are held in by pinch-clamp type clamps instead of set screws.

Locktite doesn't like the temperature of a gas block / barrel and will work poorly.

Pinch-clamp style gas blocks are the next best thing to taper-pinned.

The one you identified uses this clamping technique; other than that, I don't know anything about it. Another option is the JP - everything they make is top-notch:
http://www.brownells.com/.aspx/sid=61247/sku/Standard_Gas_Block__Black_Stainless
Click to expand...

Loc-tite can come rated for high heat,i have used stuff that will not be affected by heat.
Bet thing to do wit ha bolt on gas block is to use loc tite then peen the set screws into place.
bbb
 
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