Custom Block III – Air Efficiency

We don't optimise a single component. We optimise the entire system.

Custom Block III – Air Efficiency is the third level of the PRIMOREGGIMENTO.COM upgrade programme, focused on pneumatic system optimisation and internal gearbox servicing for AEG airsoft replicas.

Starting from €259.00.

It includes the previous Custom Block levels and adds comprehensive gearbox work aimed at reducing air leaks, improving shot-to-shot consistency and making more effective use of the energy generated by the mechanism.

Features and technical specifications

• Workshop: PRIMOREGGIMENTO.COM
• Service: pneumatic system optimisation and internal mechanical servicing
• All Custom Block II – Hop Control work, including level I – Precision
• Complete gearbox disassembly
• Full inspection and servicing of the internal mechanics
• Pneumatic system inspection and optimisation
• Installation of components required to improve air sealing
• Optimisation of the fit between the cylinder, cylinder head, piston, piston head, air nozzle and tappet plate
• Complete gear shimming
• Lubrication inspection and reapplication where necessary
• Chronograph checks and final functional testing
• Components: high-quality replacement parts selected according to the replica's platform and configuration

Efficiency starts with air sealing

In an AEG replica, the pneumatic assembly must compress and transfer air to the BB consistently. Even minor leaks, which may not be immediately noticeable during use, can cause velocity variations between shots and affect trajectory.

Custom Block III aims to improve air sealing and correct system operation without necessarily seeking an increase in power output.

Opening the gearbox also allows the internal mechanics to be inspected, including gear shimming and lubrication. These are important factors in reducing friction and promoting consistent operation.

Targeted improvements

• Greater velocity and trajectory consistency
• Reduced pneumatic air leaks
• Improved compression system efficiency
• Smoother mechanical operation
• An optimised foundation for Custom Block IV – Gear Ratio

Results depend on the replica's initial air sealing, manufacturing tolerances and component condition.

Frequently asked questions

Are all pneumatic components replaced?

Not necessarily. We inspect the existing components and retain those already suitable for the configuration. Replacement parts are installed where needed to improve sealing and operation, avoiding unnecessary substitutions.

Does better air sealing increase power output?

It can change power output because greater efficiency makes better use of compressed air. However, the objective is shooting consistency rather than increased power. The configuration is adjusted when necessary and checked with a chronograph.

Does the service also include gear replacement?

Custom Block III includes mechanical servicing and complete gear shimming. Installing a new gear set with an optimised transmission ratio is the distinctive feature of Custom Block IV – Gear Ratio.

The Custom Block philosophy

We have been studying and upgrading airsoft replicas since 1997. In 2004, this experience became part of the everyday work of PRIMOREGGIMENTO.COM.

The Custom Block method starts with assessing each replica's actual needs and carefully optimising component fit. The value of the service lies in tuning the complete system, not in the number of parts replaced.