The Second Hand Firearm - Diana Panther 31 .177 Air Rifle is a full-size break-barrel sporting air rifle built around Diana's established Model 31 spring-piston platform. Chambered in 4.5mm / .177 calibre, the Panther 31 combines a rifled steel barrel, conventional spring-powered piston system, adjustable two-stage trigger and durable synthetic stock in a straightforward single-shot design. The Panther specification was developed as the synthetic-stock counterpart to Diana's traditional timber-stocked Model 31, retaining the same core mechanical architecture while providing a more weather-resistant sporting configuration.

The Panther 31 uses a self-contained spring-piston powerplant, meaning it requires no external air cylinder, CO₂ cartridge or charging equipment. Cocking the break-barrel action compresses the internal mainspring and simultaneously provides direct access to the breech for loading a single pellet. Once closed, the barrel locks back into alignment with the receiver ready for the next shot.

Diana Panther 31 .177 Key Features

• 4.5mm / .177 Calibre: Chambered in .177 calibre, the smaller-bore configuration offered within Diana's Panther 31 range and a widely established calibre for recreational air-rifle shooting.
• Spring-Piston Powerplant: Uses a conventional steel mainspring and compression piston rather than a pre-charged pneumatic or gas-cylinder system, keeping the rifle mechanically self-contained.
• Break-Barrel Action: The barrel pivots downward as part of the cocking cycle, compressing the mainspring while simultaneously opening the breech for direct single-pellet loading.
• Single-Shot Operation: One pellet is manually loaded into the breech for each firing cycle, keeping the feed system mechanically simple and eliminating the need for a magazine.
• Rifled Steel Barrel: A precision rifled steel barrel provides the bore geometry required to stabilise compatible .177 calibre pellets.
• Diana T06 Trigger: Later Panther 31 rifles use Diana's T06 two-stage trigger system, providing a clearly defined first stage followed by a separate release stage.
• Adjustable Trigger: The T06 mechanism provides factory adjustment within Diana's intended operating range, allowing the trigger characteristics to be refined without replacing the original assembly.
• Automatic Safety: Diana incorporates an automatic safety that engages as part of the cocking cycle, providing an additional mechanical safety step before firing.
• 11mm Dovetail Rail: The receiver incorporates a standard 11mm air-rifle dovetail for compatible scope mounts.
• Open Sight System: Factory configurations use a front sight paired with an adjustable rear sight, allowing the rifle to be used without an optic.
• Synthetic Panther Stock: The Panther variant uses a durable synthetic sporting stock in place of traditional timber furniture, providing greater resistance to moisture and environmental changes.
• Ambidextrous Stock Geometry: The stock design is intended to accommodate both right- and left-handed shooters, making the Panther 31 suitable for a broad range of users.
• Textured Grip Areas: Moulded grip surfaces around the wrist and forend provide additional purchase while retaining the low-maintenance characteristics of synthetic construction.
• Full-Size Sporting Platform: The Panther 31 is built as an adult-sized sporting air rifle rather than a compact youth model, giving it the dimensions and handling characteristics of a conventional full-length rifle.

Technical Specifications

• Brand: Diana
• Model: Panther 31
• Product Type: Break-barrel air rifle
• Condition: Second hand / pre-owned
• Calibre: 4.5mm / .177
• Action: Single-shot break barrel
• Powerplant: Spring piston
• Barrel: Rifled steel
• Feed System: Single shot
• Trigger: Diana two-stage adjustable trigger on applicable T06-production rifles
• Safety: Automatic safety
• Optic Mounting: 11mm dovetail rail
• Sights: Front sight with adjustable rear sight
• Stock: Synthetic sporting stock
• Stock Configuration: Ambidextrous
• Best Use: Recreational target shooting and lawful sporting air-rifle use

Second Hand Firearm

As a pre-owned air rifle, this Diana Panther 31 .177 should be assessed as an individual firearm. Mechanical condition, bore condition, breech lock-up, mainspring performance, piston seal condition, trigger operation, safety function, stock integrity and the condition of any included sights or mounting accessories should be confirmed through the licensed dealer before purchase.

The Second Hand Firearm - Diana Panther 31 .177 Air Rifle combines Diana's established spring-piston engineering with a rifled .177 calibre barrel, break-barrel action, synthetic Panther stock and adjustable sporting trigger system. Its self-contained mechanical design and full-size proportions make it a straightforward traditional sporting air rifle built around one of Diana's long-running break-barrel platforms.