White Oak 1-8 twist 24” AR barrel. Threaded 5/8 x 24. Barrel has around 300 rounds on it. Excellent shooting stick. $275 shipped PP F&F or add extra to cover fees.
Not done precise measurements, but from the looks of it, it is .750, then steps up at the gas block to .936" and looks to be 1" or 1.050 up to the barrel extension. Pretty sure the gas block I'm running is a .936 anyway.