What size of buffer tube is on a Bushy AR 15?

[50AE]

What size of buffer tube would the one on a standard Bushy AR be?

I would assume commercial. The flattop i have has the standard POS plastic adjustable stock.

Just wondering, as i am too lazy to bring the calipers home from work.

Thanks,

 

[zykopat]

Mil-spec tubes will have the last few threads flattened by the profiling operation...