Unfortunately we are not offering pins at the moment.
Yes. if your gun already has a magwell then you can reuse that pin. if your gun doesn't have a magwell you will need the extended Dawson/Staccato MSH pin.
The LoPro Magwell will accept all dawsons base pads. it will accept every 10-8 performance base pad except the 140mm to c2/ods. We obviously can't test every possible combination. if you find something that doesn't work please let us know.