It can be a 1/9 on the early mini action 223s or 1/8 on the newer ones. The barrels are not marked to tell you.
I have the same and he is selling in a youth stock for my 14 year old daughter. Shots 3 shot 1 to 1.25 moa groups without any work and a nice trigger.
Handy guns with a smooth action.
Spence