Hop-Up Package for M4 AEG (V2)

The hop-up package for M4 brings together the two parts that decide how straight and how far the BB flies: a CNC-machined hop-up chamber and a Maple Leaf Super Macaron bucking. The package is designed as an add-on to our M4 builds and can also be bought on its own for an M4/AR15 AEG with a standard V2 gearbox.

The gearbox decides how hard the BB is fired, but it is the hop-up that decides how it flies. A plastic chamber with loose adjustment loses its setting during play, and a worn standard bucking gives different lift from shot to shot. The chamber in the package is machined from metal and holds its adjustment, and you choose the bucking in the hardness that suits your replica's velocity.

Stable adjustment and consistent lift

• CNC-machined hop-up chamber for M4: The chamber is machined from metal rather than moulded plastic, so the adjustment stays put and the barrel sits firmly and centred. The chamber is supplied without adjustment gears – you reuse the gears from your current chamber.
• Maple Leaf Super Macaron in the hardness you choose: The Macaron bucking's double contact surface gives a wider, more consistent grip on the BB than a standard single-nub bucking. Choose 50° below 110 m/s, 70° at 110–140 m/s and 75° at 130–150 m/s.
• Fits kits with and without barrel: The package does not include a barrel, so it also suits our High-Speed kits, where the barrel is already part of the build. If you want a barrel included, choose the Precision Package.
• Approx. 10% cheaper than the parts separately: Like our other packages, the price is set below the sum of the individual parts.

Maintenance and safety

• The hop-up chamber sits between the gearbox and outer barrel – the swap requires disassembly of the replica. If you haven't done it before, we recommend having it fitted in our workshop
• Choose the bucking hardness according to your replica's velocity – too soft a bucking gives too much lift at high velocity, too hard too little at low velocity
• Clean the barrel and bucking regularly with a cleaning rod and a dry cloth – silicone in the barrel gives uneven lift
• Always measure velocity with a chronograph after fitting, and stay within the site's limits
• Always wear approved eye protection during play and testing