For sale/wanted (Please be aware of scams) discussion

I’m looking to swap my 42mm Steelwerks base ring, which has a standard locking pin, for one in the 45mm size. My current 45mm standard fit is just slightly too snug; I’m hoping that an anatomical design will help take off some of the pressure. Ideally, I’d prefer to keep this transaction within the US since it simplifies things somewhat.