am I not right in thinking that if you want to replace a bog standard turret with a tactical turret, you will actually need the manufacturer to remove the original one, install the new one, re-gas, etc. etc. you can't just stick a tactical turret on top of a standard for-zeroing-purposes turret, or pull it off and stick a new one on...
I know that when I looked at getting a BDC on my S&B, they require a bit of work in Germany to replace the original one.