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4/28/2025 11:48:53 PM EDT

Had this rail for a few years now and just noticed the rail is off. Tried it on different uppers and with different barrels with the same issue in the same direction on each. It seems like the internal face of the rail doesn’t sit square against the face of the barrel nut.

Can’t ever remember dropping the rifle that would have bent it.

Shimming straightened it oiut, but still bugs me. Anyone else ever deal with this??


Douglas barrel
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Colt barrel
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Shims
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Installed with shims
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4/29/2025 7:15:20 AM EDT
[#1]
I've had it happen a few times - I've lapped a few receiver faces over the years using the Brownell's mandrel and then it's not a problem anymore.
4/29/2025 1:52:26 PM EDT
[#2]
It's not uncommon.

It's also the reason that you can still have issues with doing Mod 2 URX3/2 conversions on rifles. It was especially noticeable on SR-25s.
www.presampledepot.com
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KAC Dealer | Armorers | 07/02
4/29/2025 4:53:48 PM EDT
[#3]
Quote History
Originally Posted By ThatGuy01:
I've had it happen a few times - I've lapped a few receiver faces over the years using the Brownell's mandrel and then it's not a problem anymore.
View Quote


I don’t think this is a receiver issue. The offset was the same on 3 different uppers I mounted the ras to.

4/29/2025 4:55:22 PM EDT
[#4]
Quote History
Originally Posted By PresampleDepot:
It's not uncommon.

It's also the reason that you can still have issues with doing Mod 2 URX3/2 conversions on rifles. It was especially noticeable on SR-25s.
View Quote


Interesting. I couldn’t find any info on it searching around.

Do you think it’s the barrel nut or rail internal face that isn’t square?
4/30/2025 5:39:04 PM EDT
[#5]
Quote History
Originally Posted By Shlouf:


Interesting. I couldn’t find any info on it searching around.

Do you think it’s the barrel nut or rail internal face that isn’t square?
View Quote


Pretty sure the threaded portion of the rail gets welded on. I'm sure it's what's off.
5/2/2025 10:07:18 AM EDT
[#6]
I had a FF RAS that still wobbled when the collar was tightened all the way down. KAC had to end up replacing it for me.

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