Removing Pinned Flash Hider on AR15, the easy way.

pummumu

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Hi all,

I just want to share a little tutorial on how to remove the pinned flash hider.
After doing a bit of research, I have found these 2 great tutorial that I followed.

https://www.canadiangunnutz.com/for...rms-XCR-FAQ-post/page76?p=7411081#post7411081
https://www.youtube.com/watch?v=R5Surd-7FOI&t=8s

Now, I am a newb in terms of fixing my guns and with tools, so I hope this easy step by step can help newbs like myself in removing the pinned flash hider.

1.Here is before picture. I am changing the default DanDefense m4A1 flashhider, it comes in pinned and welded.
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2. And the tools: Wrench, Dremel with reinforced cutting wheel, Dremel drill bits( not sure what the name is.)
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3. Using the bench Vise to hold the upper receiver in place, and grind away. I believe it took me about 10 minutes to carefully saw the pinned /weld area.
Once you see the pin circular outline, you have cut away the welded area. Then I use the drill bits to drill a little bit of the pin. Make sure only drill about 2-3 mm.
You dont want to drill through the flash hider and damage your barrel thread.
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4. When I think I have drill enough, I tried rocking the flash hider back and forth. Once I see the pin wobbles a little, I know that its time to use more force to turn the flash hider CW and CCW until the pin falls off.
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5.You can see that the thread has no damage, the black gunk covering the pinhole is just carbon build up. Give the thread a really good wipe with acetone, until no more carbon visible on the paper towel. Do not use lubricant/ CLP to clean the thread, you want it really dry so the Rockset will work.
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6. Once clean, then its ready for new flash hider. Follow the instruction from the new flashhider to see how many shims to use etc.
Afterward making sure the flash hider is properly alligned, Rockset*( it comes with Surefire FH) it , and you are good to go!
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I hope this helps. Big thanks to Beniw765 and Tcodyw88 for the original tutorial.


cheers!
pummumu
 
Last edited:
Good write up. Unfortunately regular Loctite would break down from heavy shooting ie multiple mag dumps etc. There's probably no need for it if you torque it to recommended spec using a crush washer, jam nut, peel washers or shims. If you really want to secure it, you can use Rockset instead of Loctite but it'll be a b!tch to remove 'cause it breaks down at around 2000F.
 
you are right, sorry. I did use Rockset that comes with Surefire. I will edit my comment above.
thanks for catching it!
 
TY, Craig0ry! Im curious why would you want to weld the flashhider? since we dont have barrel length restriction for AR15 here
 
Unless you're taking it to the U.S?

While I understand the theory, does it actually work in practice?

What I mean is, even if you pin it, won't it be registered as a 14.5" upper as per Canadian standards? Ie. isn't that what the ATF go by when you fill out the info on the form?
 
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