By adding to cart, I understand, acknowledge, and agree to the Export Policy. I am a U.S. Person, and I do not intend to export this product.Our Trail-Lite Picatinny Scope Bases easily mount on your factory Browning Buck Mark pistol and Trail-Lit Barrels. The accessory rail fits on your factory bull barrel making it so you can easily mount a light under the barrel. Note: This rail requires your factory barrel to be drilled and tapped. Screws included. Standard Scope Base 4.97 inches. Integral Scope Base (Includes Rear Sight) 4.97 inches. Accessory Rail (Requires Drill & Tap Service) 2.63 inches.