What Calibers will the OPS-416 work with no Issues?

4.  What Calibers will the OPS-416 work with no Issues?

• - 223/5.56 – Just install and go.  
• - 7.62x39 Russian - You will have to use a lighter spring from www.wolfsprings.com. A standard 3oz buffer will work fine.
• - 300 Black Out - You will need to use a lighter spring from www.wolfsprings.com and a standard 3oz buffer will work fine.
• - 6.5 Grendel - You will need to use a lighter spring from www.wolfsprings.com. A standard 3oz buffer will work fine.
• - 6.8mm Rem SPC – A standard buffer spring and standard 3oz buffer will work fine.
• - 5.45x39mm Russian

*A standard 3oz buffer will work with all calibers.

*Note: Do not use a gas block with an adjustment. They lose too much gas.