The Hawke Flip-Up Cover – Objective (40mm AO) (Model 61004) is a mechanical lens cap engineered to protect riflescope front optics from rain, dust, sand, and field debris. Constructed from high-grade CNC-machined aluminium with a matte black finish, this objective cover screws directly into the threaded objective bells of compatible Hawke riflescopes. It features a spring-loaded design that allows for fast, one-handed operation during field use, while its 360-degree rotational positioning allows the cap to open flat sideways, vertically, or in any orientation required for rifle and barrel clearance.

Key Features

• Precision Threaded Interface: Screws directly into the objective assembly of 40mm Adjustable Objective (AO) scopes, providing rigid mechanical protection against brush scratches and direct impact without slip-on rubber bulk.
• 360° Rotational Positioning: Designed to lock down securely at any angle, allowing the cover to flip open in any desired direction to prevent obstruction of field view or clearance issues.
• Spring-Loaded Mechanism: Features an easy-to-use flip mechanism designed for one-handed operation and rapid target acquisition in fast-paced hunting conditions.
• Durable CNC Aluminium Build: Fabricated from machined aluminium to withstand standard centerfire and spring-piston airgun recoil impulses.

Product Specifications

• Model Number: 61004
• Lens Interface Size: 40mm Adjustable Objective (AO)
• Material: CNC-machined aluminium
• Finish: Matte black
• Scope Compatibility: Hawke riflescopes with 40mm AO threaded lenses (2015 model collections onwards, including compatible Vantage and Airmax AO models)
• Power Requirements: None (fully mechanical)

Who is the Hawke Flip-Up Cover 40mm AO for?

• Rimfire, centerfire, and air rifle hunters — Requiring direct mechanical front glass protection for threaded 40mm adjustable objective scopes to safeguard anti-reflective optical coatings while moving through abrasive bushland or wet weather.
• Target shooters and pest controllers — Needing a rapid, one-handed spring-loaded flip-up objective cover that seats flush on a 40mm AO lens assembly and can be indexed 360 degrees to clear custom rifle furniture or iron sights.

Less suitable for: Riflescopes with non-AO standard 40mm bells (which require non-AO SKU 61003 threaded covers), larger 50mm or 56mm objective assemblies, non-threaded objective bells, Hawke Frontier 30/Frontier 30 SF optics, or XB/XB1 crossbow scopes, which require larger dedicated threaded covers, specialised series caps, or standard slip-on bikini covers.