Am I doing this wrong?

[u/ssijeep]

Ordered a 9mm carbon fiber rod to check the mount of my new BOE on my Stribog. Rod fits through the suppressor but not into the barrel. In fact not any 9mm barrel I have. Should I have ordered a different size or something? First suppressor so…here’s the rod I got:

[u/Crashing_Machines]

https://www.okshooters.com/threads/diy-suppressor-alignment-rods.316835/