The Hawke Adaptor Base - 3/8" To Weaver With Elevation (Model 22403) converts standard 3/8-inch (9–11mm) parallel dovetail receivers into a standard Weaver/Picatinny mounting platform. Measuring 137 mm in total length and weighing 110 g, this one-piece adapter is engineered to solve projectile drop and mechanical barrel droop. It features an adjustable rear set screw that allows shooters to tilt the top rail downward, adding elevation compensation without exhausting a riflescope's internal turret travel. Machined from high-grade anodised aluminium with a matte black finish, the base secures to the host platform via quad hex clamping bolts and includes an integrated recoil stop screw to prevent movement under spring-piston or rimfire recoil.

Key Features

• Mechanical Elevation Adjustment: Built-in rear set screw allows downward angular tilt of the top rail to correct barrel droop or compensate for long-range projectile drop.
• Quad Hex Clamping System: Utilises four M5 × 0.8 hex clamping bolts (4 mm hex key) along a 118 mm dovetail clamp section for rigid receiver retention.
• Integrated Recoil Stop: Features an integrated recoil stop pin/screw to eliminate base creep under heavy spring-piston airgun and rimfire recoil.
• Cross-Platform Optic Mounting: Adapts 3/8-inch (9–11mm) dovetail rails to fit modern Weaver and Picatinny-compatible scope rings, red dots, and night vision accessories.
• Snag-Free Aluminium Construction: High-grade anodised aluminium body with rounded edges to prevent catching on gear or clothing.

Specifications

• Brand: Hawke Sport Optics
• Model SKU: 22403
• Base Interface: 3/8" (9–11mm) Dovetail
• Top Interface: Weaver / Picatinny-compatible
• Overall Length: 137 mm (5.4 in)
• Clamp Base Length: 118 mm
• Dimensions: 137 mm × 24 mm × 16 mm (5.4" × 0.9" × 0.6")
• Weight: 110 g (3.9 oz)
• Material: Anodised Aluminium
• Colour/Finish: Matte Black
• Fasteners: 4 × M5 Hex Clamping Bolts (4 mm Hex Key)

Who is the Hawke Adaptor Base - 3/8" To Weaver With Elevation for?

• Airgun target shooters — provides downward angular tilt via an adjustable rear screw over a 137 mm total length to overcome mechanical barrel droop on break-barrel air rifles without exhausting internal optic elevation travel.
• Rimfire hunters — secures modern Weaver-compatible optics to standard 3/8" (9–11mm) dovetail receivers using four M5 hex clamping bolts and an integrated recoil stop screw across a 118 mm clamp base to prevent optic creep.

Less suitable for: Firearm receivers using 17mm, 19mm, or native Picatinny rails, as well as heavy recoiling centrefire magnum rifles; these platforms require dedicated direct-mount steel centrefire bases.