Unlock smoother airflow, improved consistency, and more efficient power delivery — with a simple drop-in upgrade.
Take your airgun to the next level with our precision CNC-machined high-flow transfer ports. Designed and manufactured in the UK, these ports replace the factory part to provide cleaner, less turbulent airflow for more consistent velocities, improved accuracy, and greater tuning flexibility — whether you shoot pellets or slugs.
Smoother, higher-efficiency airflow
Improved shot-to-shot consistency
Potential for increased power output
Better accuracy across a wider range of ammunition
No permanent modifications — direct drop-in installation
CNC-machined from strong, corrosion-resistant materials
These high-flow ports are engineered with a precision internal chamfer to reduce turbulence as air moves through the system. Combined with tight CNC tolerances, this allows:
More efficient power delivery
More consistent velocities
Tighter groupings downrange
A smoother, more predictable tune
Ideal for anyone wanting cleaner airflow and repeatable performance — from tuners and target shooters to hunters looking for stable power levels.
Direct replacement for the factory transfer port
No cutting, drilling, or permanent modifications
Installs in minutes with basic tools
Simply drop it in and start tuning.
We’ve kept prices as low as possible, but with material and tooling costs continuing to rise, we will eventually need to increase prices on future batches. So it’s worth grabbing one now while they’re still at the lower price.
✔ Crosman 1377 (1998 - present day)
✔ Crosman 1322 (1998 - present day)
✔ Crosman 1740
✔ Crosman 1760
✔ Crosman 2240
✔ Crosman 2250 / B / XL
✔ Crosman 2260
✔ Crosman 2289
✔ Crosman 2300
✔ Crosman 2400
✔ Crosman PC77
(all calibres)
Direct drop-in installation.
There’s no universal “best” transfer port — every airgun responds differently, and your chosen ammunition can influence airflow needs.
Most shooters select 2–3 port sizes to find the perfect balance of:
Airflow
Velocity
Consistency
Shot count
A larger transfer port allows more air to pass through, which can:
Increase muzzle energy
Improve performance with heavier pellets and slugs
Provide a more power-focused tune
A smaller or standard-size port generally offers:
Better air efficiency
Higher shot count
Smoother tuning for pellets or lower-power setups
If you’re unsure which size to choose, you can measure your factory port and select:
The same size for consistent behaviour
Slightly larger for increased airflow and power potential
Airflow changes can affect muzzle velocity and muzzle energy.
For best results, always measure before and after installation using a chronograph.
Important: Ensure your setup remains within your local legal power limits.
We also design and CNC-machine bespoke airgun components.
If you need a specific size, flow profile, or new idea — we can build it.