If you have a P220 ST with the original style rail, this new P220 ST Accessory Rail Adapter fits the original P220 ST dovetail rail and accepts the majority of after-market tactical lights and lasers designed to fit the M1913 Picatinny Standard.
Machined out of high impact Delrin, the Accessory Rail Adapter shares the same dimensions as the integral rail found on the P226 SO and ST models. The adapter includes mounting screws and allen key for easy installation.