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3/1/2026 10:55:07 PM EDT
I have an old AAC 3 lug “black out” 9 mm flash hider. Last fall, I put it on my B&T APC 9 for matches and let it on for a month (stupid me). It will not come off now.

For the past 3 months, I have tried soaking it in a CLP. I have tried Kroil. The locking mechanism appears to be broke, and it won’t spring up and down like a normal 3 lug. So I cannot simply push it down, rotate and remove it like any other 3 lug device. A friend suggested a rubber mallet, but that seems to have made it worse.

Thoughts? I’m guessing I have to give it to a gun smith who won’t damage my B&T barrel.

Thanks
Elite Soviet Democrat
3/2/2026 12:13:00 AM EDT
[#1]
Throw it in the freezer for 24 hours then try.
3/2/2026 7:48:25 PM EDT
[#2]
Have you see the AAC Flash Hider Installation/Removal tool?  I have one of these and use it regularly.

AAC FH tool
"Bitter clinger since 7 years old. Now a full-time deplorable and garbage person."
3/2/2026 9:59:50 PM EDT
[#3]
Quote History
Originally Posted By jlebowski:
Have you see the AAC Flash Hider Installation/Removal tool?  I have one of these and use it regularly.

AAC FH tool
View Quote


Um that will not work on their 3 lug flash hider: https://www.opticsplanet.com/advanced-armament-corporation-blackout-non-mount-flash-hider-for-9mm-mp5-style-3.html

Not sure to get the entire SBR in my freezer. I would have to remove the stock and aimpoint etc. Is the purpose to allow the 3 lug mechanism
to reset?
Elite Soviet Democrat
3/2/2026 10:51:48 PM EDT
[#4]
I think this came up the other day.

Other Thread
Satisfaction is the death of desire.

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