Yes I had one.
I think the twist is marked on the barrel but you could measure it too

7 twist is sort of an overkill for 223 unless you want to shoot 90 gr bergers.
1:8 is enough or 80 gr bullets.

That said my gun shot 52 gr amaxes 1/4-3/8".
It also shot 90 gr bergers at 3/8"