Thureon Defense barrel diameter.

[JBD]

Ordered a Thureon Defence 9nn glock mag and am looking at mounting a gas block picanny mount for a front sight. Anyone know how big the diameter of a thureon defense barrel is.

 

[JACKSMYDOG]

The first inch or so at the end of the forearm is .690 and then it drops down to .684 and stays constant to the end.