Amazon.com : TRINITY Compact Weaver Mounted redt Sight for Walther p99 Tactical Home Defense Optics Accessory Aluminum Black Picatinny Weaver Mount Adapter Class IIIA 635nM Less Than 5mW. : Sports & Outdoors
P99 Gen 1 Rail Adapter | Walther Forums
WTS: P99 Gen 1 Titanium Model (fairly rare), HC mags, and rail adapter - $525 Shipped DFW/TX | Walther Forums