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8/11/2013 9:26:24 AM EDT
Ive got a barrel left over from another build that Id like to turn into a dissipator build but I cant find anywhere that tells me what the diameter of the barrel is where the FSB would go.
The 16" socom barrel
Also is there a fixed front sight base that is clamp on? All the ones Ive found are the normal pinned type. Which brings me to my next question, if I go the pinning route who should I send my upper to, to get the FSB pinned? I may go the pinned route anyway since it looks better. Ill be using the magpul handguards if that makes any difference. Thanks
8/11/2013 11:51:35 AM EDT
[#1]
Finally found my calipers and measured in front of the gas block and the diameter is .730.
8/11/2013 11:58:17 AM EDT
[#2]
Clamp on ones do exist, however I would send to ADCO and have it pinned for the look you are after.
8/11/2013 12:32:19 PM EDT
[#3]
Am I going crazy or is it really hard to find a fixed front sight block? Found plenty of flip up and picatinny sight blocks but not the normal fixed front sight block.
8/11/2013 2:32:16 PM EDT
[#4]
Armalite makes a clamp on that would work. Pinning it removes all concern about "clamp on's". ADCO can pin it, and they can put one of theirs on so you don't need to send one in with the barrel. Sometimes it's cheaper to just buy a barrel already set up for it.
8/11/2013 4:35:06 PM EDT
[#5]
Good deal, Ill give them a call tomorrow. Starting out with the right barrel definitely would've been the easiest route but the barrel was "free" since it was off another build and I doubt I could get more than 100 or so for it. Plus its a known good shooter, for whatever reason itll shoot 1" groups at 100 with cheapo pmc bronze 55gr and a pst 1-4 scope. Ive never had the cheap stuff shoot that well so I dang sure don't want to get rid of it. Hopefully they don't charge me an arm and a leg to pin a FSB on it and add a delta ring.
8/11/2013 5:47:15 PM EDT
[#6]
Quote History
Quoted:
Am I going crazy or is it really hard to find a fixed front sight block? Found plenty of flip up and picatinny sight blocks but not the normal fixed front sight block.
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Here you go...

Garage sale!
8/11/2013 6:43:28 PM EDT
[#7]
You will not be able to pin a FSB on that rifle unless you have one made up with a bore .0005" larger than your barrel.
You can't put a standard 3/4" bore FSB on a .730" barrel.

I've used a bunch of these.
clamp on FSB
I built 2 dissapators with a strip of stainless steel shim stock wrapped around the barrel under the FSB.
The phosphate finish (parkerized) on the FSB and the barrels I used really gripped the soft stainless shim, and it would take a mighty big hit to move the FSB.

The Melonite finish on your SOCOM barrel may be a bit more slippery... not sure how well it will grip the stainless.

If you want a strip of stainless shim I can snail mail you one since the only way I could find to buy it was in a sheet.
Installed carefully, you cannot even see the shim stock.

Joe

*edit* I have one of those SOCOM barrels. Today I zeroed a new optic on that rifle (USO SR-8S) with plinking reloads then shot 2 five shot groups both under .9" at 100 yards off a front and rear bag with 75 gr Hornady HPBTs and 22.2 gr IMR 4895. Good barrels.
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