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VA, USA
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Posted: 2/13/2018 9:38:08 PM EDT
Hey guys ive got a bit of an issue I hope you can help with. Im working on my first precision AR. Ive got an Odin Works 20 inch DMR profile 6.5 grendel barrel which came with their adjustable gas block.
Today the Aero Precision Atlas rail showed up so i did a quick mock up to see if the parts fit. The top portion of the gas block where the gas tube goes in touches the rail. I figure I can fix this problem with a smaller non adjustable gas block. Im still concerned that there will not be enouch clearance for a precision build. Did I mess up buying a slim rail for a precision rifle?(interior diameter is listed at 1.3 inchs) |
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PA, USA
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Posted: 2/13/2018 10:18:22 PM EDT
[#1]
Had the same issue and my OCD wouldn't let me keep it on, mine barely touched where it clamped around the barrel. Went with bcm low pro and cleaned it up. Doubt it would of made much of a difference.
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VA, USA
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Posted: 2/13/2018 10:35:25 PM EDT
[#2]
Thanks for the reaponse. What rail did you have an issue on?
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PA, USA
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Posted: 2/14/2018 3:23:03 AM EDT
[#3]
Bcm kmr and vltor clamp low pro. Very small corner touched the rail.
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Posted: 2/14/2018 8:48:13 PM EDT
[#4]
This is one of those cases where you can't really see it, nobody would ever know it and it won't affect anything but you know it so it bugs the heck out of you. So, measure the inside diameter of your handguard and then go find one that is slightly larger. If you want to go with a really nice handguard that can clear just about anything you want you can go with a JP Rifle, those have a 1-3/4 ID after you add on their proprietary rails where you need them. I'm pretty sure that Noveske has a large and small also.
Having bought a few of the wrong handguards I now only buy them when they show the specs so I know what I'm getting. |
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VA, USA
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Posted: 2/16/2018 11:15:24 AM EDT
[Last Edit: cjm2022]
[#5]
Do you think a non adjustable smaller gas block is also a fix?
ETA: How much clearance do I need between rail and gas block? The new one doesnt touch am i GTG? How much does the barrel actually whip? |
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Posted: 2/17/2018 11:06:48 AM EDT
[#6]
Yes, you can go with a smaller gas block. The barrel does not whip it simply vibrates at some order of harmonic. If the barrel is tight and the handguard is tight there wont be any wear on your current gas block. If you've installed the gas block correctly it's not going anywhere. I use two piece JP gas blocks and I don't use Loctite or pin them and they never move.
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FL, USA
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Posted: 2/17/2018 6:26:31 PM EDT
[#7]
Try filing it down. Thats what I had to do to make a 936 gas block fit under a slim hand guard.
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VA, USA
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Posted: 3/6/2018 10:39:10 PM EDT
[#8]
Thank you all for the input. I already ordered a much smaller non adjustable but i think ill hit the odin adjustable one with a file and see how that works out. I will update you guys and post some pictures when I'm done
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CO, USA
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Posted: 4/21/2019 8:56:50 AM EDT
[#9]
Subscribed for update. Looking to use Odin adjustable with Atlas rail on a 308 build.
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CO, USA
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Posted: 4/21/2019 9:05:50 AM EDT
[#10]
an ID of 1.3? That's tight. Superlative Arms makes good small AGBs, there's a specsheet in the part description. Aero makes gas blocks too.
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Posted: 4/21/2019 4:25:42 PM EDT
[Last Edit: bfoosh06]
[#11]
If your gas block bonks the free float tube, your consistent accuracy will suck.
If it is touching , and every time the barrel whips ( or what ever you care to call it ), it is going to alter the barrels harmonic wave.... and not do it consistently the same way. How "bad" will be dependent on the barrel profile, and how firmly the contact is being made. Barrel whip can be dramatic... again, barrel profile matters. Personally, I prefer to error on the side of to big... especially if the build is about precision. MI makes some suppressor ready AR15 handguards as well... the ID is 1.75" as well. Random youtube video, I have no idea of the caliber  Barrel whip  2012 Daniel Defense Video Series: The Importance of Free Floated Barrels |
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