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Posted: 5/28/2020 5:38:14 PM EDT
I have a 16" US made AUG barrel with no flash hider.  I don't know the thread pitch, but was told by the seller that they were contract made by FN.  Will an old-school Austrian tulip-style flash hider and check nut (The octagonal flats) from the pre '89 days fit?  

Thanks in advance
Link Posted: 5/28/2020 6:04:28 PM EDT
[#1]
If it has LH threads (which would mean it's M13x1 LH) then yes.

If it has RH threads then it's 1/2-28 (and should also have a groove around the barrel aft of the muzzle threads.

Pic of barrel groove on 1/2-28 barrel (flash suppressor is aftermarket):
Attachment Attached File

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