EPeS AEG Aluminum Cylinder Head Mk.II for Version 2 & 3 Airsoft AEG Gearboxes
(Model: Medium Length / 80 Shore)

Features

• Made from EN AW 7075-T6 aircraft-grade duralumin
• Proven H+PTFE surface finish for ideal sliding properties while retaining high abrasion resistance
• Allows for increased tappet plate stroke length
• Unique mounting system allows this to be a truly universal solution for V2 and V3 gearboxes
• Mounting pin holes are designed for optimal fit in Retro Arms gearboxes
• Rubber impact pads made from polyurethane (PU) rubber with 70, 80, or 90 shore hardness and maximized 3mm thick impact areas
• Available with no impact pad for use with other available PU or sorbo pads
• Double O-ring seal provides optimal compression

A revolutionary cylinder head for V2 and V3 gearboxes. Our unique design solution brings a new standard of quality and performance. Affixing the cylinder head inside the gearbox prevents undesired movements during fire. The innovative design allows for a longer stroke of the tappet plate for maximum performance and reliability of your AEG. The combination of uncompromising manufacturing quality, which ensures perfectly smooth surfaces, and unique H+PTFE surface finish allows for a maximally fluent operation of the nozzle. The material used for the construction aircraft-grade duralumin with H+PTFE surface finish ensures longevity of parts. Special impact rubber pads of our own design are made from durable polyurethane to improve airflow and provide maximum longevity and impact absorption. They are available in three stiffness grades and four thickness options for the ideal setting of the AOE.

The EPeS cylinder head offers two unique design solutions:

Increased tappet plate stroke
Compared with standard cylinder head designs, the surface that stops the tappet plate in its rearmost position has been moved towards the rear of the cylinder head. With an adequate tappet plate (e.g. SHS) or with a cam that increases the length of the stroke, it is possible to use a nozzle up to 1 mm longer than in standard designs. This innovation will be especially welcomed by the owners of V2 gearboxes, as V3 is already designed with longer tappet plate stroke length.

You can then, e.g. in AR15 setups, use a 22mm long nozzle which offers a tighter seal of nozzle to hop-up contact (or rather nozzle to hop-up bucking lip). The longer nozzle also helps to improve the feeding process in problematic cases and solves the eternal dilemma: "A longer nozzle will provide better tightness, but the gun won't feed BBs as reliably or it will stop feeding at all. A shorter nozzle will feed reliably, but it will lose performance." With the EPeS Airsoft Mk.II cylinder head you no longer need to make compromises. Instead, you can pick both choices: high performance and reliable feeding.

Unique system for fitting the cylinder head inside the gearbox
The EPeS Airsoft Mk.II cylinder head has two M3 threads for grub bolts. These bolts are driven from the front of the cylinder head and allow for smaller pin holes for the gearbox mounting pins. This way, the cylinder head can always be placed neatly on the front plate of the gearbox with no allowance. This ensures issue-free operation of the air system without performance losses or other common problems leading to early wearing out of parts.

A loosely-fitting cylinder head allows for too much axial sway of the nozzle. This effect introduces a host of issues (loss of performance, inconsistent performance, nozzle jams in the hop-up chamber, feeding issues, etc.). Additionally, it also introduces uneven contact between the cylinder head and piston head impact rubber pads, which can damage the piston head or the piston itself.

Installation of the cylinder head is easy. By tightening the front grub screw, the size of the hole for the gearbox mounting pin is adjusted (and also the amount of allowance space for the mounting pin). Keep adjusting by trial and error until you reach a tight fit. This mechanism allows for a truly universal solution for seating the cylinder head in most of the available gearboxes. The default position of the pinholes is optimized for gearboxes from the Czech manufacturer Retro Arms.

Manufacturer: EPeS Airsoft

NOTE: EPeS Airsoft strongly recommends you affix the grub screws using a high strength threadlocker