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This is a heavy profile barrel m4 socom barrel. Not a true HBar a true HBar Under the handguards diameter is 1.0" from Barrel Extension to 1" before gas block, there is a 10 degree chamfer to a diameter of .850" - Gas block diameter is .750" for a length of 1.875". It steps down to .740/ .745" all the way to the muzzle crown or threads. - Target muzzle is 11 degree crown. - Threaded muzzle is .620" long by .500" diameter. Threads are 1/2 x 28tpi for a length of .500" / .510".
Hi Austin and welcome back. To put it to rest just check with a local FFL. You can find one by Zip Code and proximity here: https://www.budsgunshop.com/ffl.php ----------------- Cheers and stay safe!