The Hawke 3/8" (Rifle) to Weaver Adaptor Base Extension (Model 22404) is a one-piece mounting rail designed to convert standard 3/8-inch (9–11mm) rifle receiver dovetails into a Weaver-specification top rail. Machined from high-grade aluminium with a matte black anodised finish, this mechanical base provides 183 mm (7.2 inches) of total top rail length with up to 50 mm of forward receiver overhang. It allows shooters to mount modern Weaver-style scope rings, red dot sights, or night vision devices onto traditional rimfire and airgun platforms while offering built-in optical elevation adjustment and flexible eye relief.

Key Features

• Dovetail to Weaver Conversion: Adapts 3/8-inch (9–11mm) receiver grooves to a Weaver-spec profile to accept standard modern optic rings and mounts.
• Built-In Elevation Tilt: Features an integrated rear set screw that delivers up to 100 MOA of downward rail tilt to compensate for barrel droop or extended-range trajectory drop.
• Extended Eye-Relief Positioning: The 183 mm top rail overhangs the receiver by up to 50 mm forward, accommodating optics requiring non-standard eye relief.
• Secure Mechanical Fastening: Dual clamping jaws secured by four M5x0.8 hex screws (4mm hex key) provide a stable 117 mm bottom clamping footprint.
• Recoil Stop Protection: Includes an integrated forward recoil stop pin to prevent base slippage under spring-piston or rimfire recoil cycles.

Specifications

• Brand: Hawke Optics
• Model Number: 22404
• Rail Length: 183 mm (7.2 inches nominal)
• Clamp Footprint: 117 mm bottom mounting section
• Weight: 119 g (4.2 oz)
• Material: CNC machined aluminium with matte black anodising
• Fixings: Quad hex clamp screws (M5x0.8 thread, 4mm hex drive)
• Base Compatibility: 3/8" (9–11mm) rimfire and airgun dovetails
• Top Interface: Weaver specification
• Max Elevation Adjustment: Up to 100 MOA mechanical tilt

Who is the Hawke 3/8" to Weaver Adaptor Extension 183mm for?

• Rimfire rifle owners mounting modern optics — Converts 3/8-inch receiver grooves into a 183 mm extended Weaver rail that adds only 119 g of mass to .22 LR or .17 HMR hunting setups.
• Airgun shooters correcting barrel droop or eye relief — Provides up to 100 MOA of mechanical elevation tilt via a rear set screw alongside a 183 mm platform with 50 mm of overhang to correct droop and establish proper eye relief on spring-piston or PCP air rifles.

Less suitable for: Rifles lacking a standard 3/8-inch (9–11mm) dovetail base, or accessories with cross bolts requiring strict MIL-STD-1913 Picatinny-spaced recoil slots; these configurations require a dedicated full-specification Picatinny receiver base or direct-mount receiver rings.