The new ScopeRib III Sights for IHMSA and NRA Handgun Metallic Silhouette are an advancement over our famous ScopeRib I Sight System. The ScopeRib III incorporates our KeyLock scope base design with a precision handgun sight system that fits 10", 10¾", 12", 14", and even 15" TC Contender and G2 barrels, and BF Pistols. Just look at these features: - Rear Sight Features 1/2 MOA precision click adjustments (1/2" per click at 100 yds). - Sharp, square sight notch in notch widths to suit your vision and application: .032", .062", .080" (most popular), and .100". Choose Narrow for Taco-Hold, Wider for traditional Creedmoor and Standing Positions (choose from the Drop Down Menu above...). - Mounts to factory 4-hole as well as custom 6-hole scope mounting screw holes. - Original "Bond" Hooded Front Sight: Adjustable post for width AND height. The ScopeRib III Sight System fits TC Contender and G2 barrels as well as BF Pistols. It includes the ScopeRib III rear base with precision adjustable sight AND the Bond hooded front with adjustable post. A Longer Hood is also available for an additional charge. Order quick detachable See-Thru Rings separately.