I have two Oryx chassis one on a .223 12 FV and one on a 6.5mm 12 FV.

Both actions dropped right in.
The AICS mags that I selected work well with the chassis and feed beautifully.
If you choose carefully, you will have plenty of length to load out to get close to the lands.
If you don't pay attention to the AICS mag you select, you might not be able to do that.

The chassis on both are solid and fit beautifully.
The 6.5 mm CM actually improved accuracy with the Oryx by 28% because it eliminated the cheap factory stock flexing.
The .223 improved accuracy but about 20%.
If I buy another 12FV, I will definitely get another Oryx.