Reservoir Mods XL – Precision Airgun Moderators
Reservoir Mods XL – Precision Airgun Moderators - is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
Delivery
Depending on the size and weight of the product, deliveries to mainland UK will be via Royal Mail First Class, or DPD for larger or heavier items. Deliveries can take 1-5 days depending on the method. Many parcels will be delivered the next day Monday to Friday, for orders placed before 12 noon.
For locations in the Highlands and offshore islands, we use Royal Mail or UPS to deliver your parcel. This also includes Northern Ireland. Deliveries can take 2-5 days depending on the method.
Returns
If you are not satisfied with your purchase, we have a 30-day returns period. In the first instance, please contact our support team via email: support@3leggedthing.com
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Reservoir Mods XL – Precision Airgun Moderators
Description
Description
Two Profiles. Same Performance.
Wavy Profile (RSV1)
A flowing, organic exterior with subtle contouring. RSV1 offers a softer visual language while retaining the same internal geometry and suppression performance as RSV2.
Chamfered Profile(RSV2)
A sharper, faceted design with clean chamfers and a more technical aesthetic. RSV2 is visually bold but mechanically identical inside.
Profile choice is purely about looks and feel — performance remains unchanged.
XL design for precision and ultimate quiet:
• 8-chamber modular design
• 20.2 cm (7.95") length
• 36 mm (1.4") diameter
• Internal volume: 95 ml
• Increased airflow management for maximum suppression
The XL versions offer greater internal volume for shooters who want the quietest possible report, while the standard models prioritise balance and handling.
Why choose Reservoir Mods?
Because effective sound suppression isn’t about brute size — it’s about controlling air intelligently. Reservoir Mods are tuned to manage pressure smoothly, reducing sharp crack without over-damping the system or upsetting the rifle.
Quiet. Controlled. Deliberate.
Specifications
Specifications
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Material
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Specs
RESERVOIR MODS XL 8-CHAMBER DIAGRAM
STAGE 01 - ENTRY & FIRST EXPANSION
High-pressure gas enters immediately behind the projectile. The bore opens into a precision-calculated volume, triggered the first and largest pressure drop.
STAGE 02-07 SEQUENTIAL VORTEX
Air expands and vortexes within each successive chamber. Compressed wool gaskets strip residual energy between every stage - natural, dense, acoustically selected.
STAGE 08 - FINAL ATTENUATION
By the 8th chamber pressure is reduced to near-ambient.The exit report is a fraction of the original muzzle energy - clean and controlled.
STAGE 09 - UNDISTURBED FLIGHT - BY DESIGN
The projectile leaves the bore ahead of the propellant gas. By the time that gas is vortexing through the chambers, the pellet is already in free flight — completely clear of the turbulence. The Mod manages the report. It never touches the trajectory.
Chamber Absorption Technology
THE MATERIAL
THAT DOES THE
REAL WORK
Every chamber in the Reservoir Mod contains a precision-cut wool/polyester gasket disc. They are not packing material. They are not incidental. At 277 kg/m³ — nearly four times the density of high-performance acoustic panels — they are one of the most deliberately specified components in the system.
The Density Advantage
Standard acoustic fibrous materials operate at densities between 8 and 80 kg/m³. The Reservoir Mods gasket discs are specified at 277 kg/m³ — a figure that places them in an entirely different performance regime.
At this density, the resistance to airflow through the gasket matrix is extremely high. Energy that cannot move freely is converted to heat. That conversion is the mechanism of attenuation.
The Blend
Wool and polyester contribute different physical properties to the same task. Wool fibre has a natural crimp that creates a highly tortuous internal structure. Polyester adds dimensional stability, ensuring each gasket holds its geometry under repeated cycles without compacting or shifting.
The result is a gasket that performs consistently across the service life of the product, not just when new.
Wool fibres perform most effectively at densities above 500 Hz — the frequency range where surface friction increases and more energy is dissipated as heat per unit of material.
The mechanism is viscous friction. As flow moves through the gasket matrix, vibrating molecules rub against the irregular interstices of the fibre network. That motion converts energy into thermal energy.
Mechanism: ISO 9053 / Delany–Bazley model for fibrous porous materialsThree mechanisms. One gasket.
Flow forced through the fibre matrix loses kinetic energy to viscous drag.
Wool's natural crimp creates a structurally complex internal path that lengthens the effective route and multiplies opportunities for energy dissipation.
The cumulative result of friction and tortuosity is heat: energy is progressively converted and dissipated into the gasket mass.
Performance is often discussed in terms of chamber count or overall volume. Those are meaningful numbers — but the material inside the chambers determines how much work each stage does.
A low-density gasket passes flow relatively freely. A high-density gasket forces that flow to surrender energy before it exits each chamber. At 277 kg/m³, this disc is specified to extract maximum attenuation at every stage.
Gasket Specification
The Features:
What's in the box?
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