You have at least 1 of my cast-offs actually.
I've had 4x Noveske's. 18, 16, 14.5 and a CHF 16". Or it might be 5 in that I doubled down and got a 2nd 16" stainless...
Also had 2x of Joel's 16" V7 barrels
4x different Centurion stainless (2x 18" mk12, a 16" recce on a Bartlein, and a 14"...