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Barrel threading says 1/2"-36 same with the flash hider from yhm
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Make sure it is not a 5/8-24 muzzle thread, as this is a standard type thread pattern for calibers larger than .223/5.56mm in a AR platform.
Although, YHM does make some unusual TPI thread patterns, so it is very possible it is a 1/2-36 TPI muzzle threading for their barrels.
(ETA: just checked and
yes it is a 1/2-36 TPI thread pattern on their x39mm barrels [It does not make much sense for a .30 cal bore, but
thats what they in fact use]).
UTG Pro free float quad rails are a good quality USA made rails and are very reasonable in price...BTE also makes some high quality
gas blocks and are made in Arizona, Aero Precision does make good quality upper receivers for the money as well...
Don't forget to get a enhanced firing pin and a extra power hammer spring for use with steel cased and surplus ammo...
Good Luck.