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Posted: 5/19/2020 2:37:12 AM EDT
[#1]
it seems that this is what i would need, its .625 gas block:
https://www.brownells.com/rifle-parts/sights/sight-parts/front-sight-bases/ar-15-625-standard-front-sight-base-prod82728.aspx one question..the page above says that holes must be drilled, so is it really a must it seems? so basically you align the front sight properly with hole on top and then drill out the barrel through the holes of that front sight? |
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Posted: 5/19/2020 3:59:20 AM EDT
[#2]
Look at the journal length on that barrel, 1.1". It isn't long enough for a front sight base, only designed for a low pro gas block.
Also you'll never get the sight straight trying to pin it at home. You'd be better off using set screws (when you find a barrel that will work with FSB). You can drill any sight for 2 #10 set screws, 1 by the sling and one up through the bayonet lug, or you can buy one for $25 from rguns.net already set up with screws. This way you can sight it in at a range and get the sight aligned before tightening the screws with red loctite. |
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Posted: 5/19/2020 4:26:30 AM EDT
[#3]
As AASG said, the gas block journal is too short on the Faxon Pencil barrels. Their Gunner barrels do have a long enough gas block journal for an FSB though. 3 to 4 ounces heavier, but still plenty lightweight.
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Posted: 5/19/2020 5:37:52 AM EDT
[#4]
If you haven't purchased a barrel yet just find a pencil profile barrel that comes with a FSB installed from the factory.
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Posted: 5/19/2020 5:47:10 AM EDT
[#5]
BTW, you mention a 7" rail, that'd leave about 2" of uncovered gas tube on a mid length. I think you need about a 9" rail to run a front sight base and mid gas system. Check to make sure before ordering.
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Posted: 5/19/2020 6:56:53 AM EDT
[#6]
Quote HistoryOriginally Posted By AASG: BTW, you mention a 7" rail, that'd leave about 2" of uncovered gas tube on a mid length. I think you need about a 9" rail to run a front sight base and mid gas system. Check to make sure before ordering. +1 |
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Posted: 5/19/2020 7:20:18 AM EDT
[#7]
the best way to do what you want is to buy the Gunner barrel with a longer gas block journal and a Fulton Armory set screw FSB.
I did it on this 18" gunner build, works great  |
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Posted: 5/19/2020 9:25:51 AM EDT
[#8]
Quote HistoryOriginally Posted By AASG: BTW, you mention a 7" rail, that'd leave about 2" of uncovered gas tube on a mid length. I think you need about a 9" rail to run a front sight base and mid gas system. Check to make sure before ordering. Exposed gas tube is fine if you're not bayonetting people. |
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Posted: 5/19/2020 10:19:32 AM EDT
[#9]
With that barrel you could install a railed gas block and attach front sight to that.
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