Typhoon F12 buffer tube thread

Hi guys.
Does anyone know if the buffer tube thread on a F12 is mil type, commercial or other?

Thanks
Mike

The thread is the same as the AR15 thread EXCEPT on the guns we have had here are quite a bit tighter fit. It may be possible to put AR15 tubes on the F-12 but it will be a VERY tight fit. We chase the threads with an AR15 tap when we install AR 15 type tubes. FYI the threads on milspec size and commercial tubes are the same on an AR15
 
Tacord full competition build with proper buffer tube and XLR buttstock.
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We are doing the left side charging handle conversions now at Tacord along with making the hardened stainless handles. If interested, please send Casey an email to inquire.
 
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