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Rocket M4 hop chamber

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What The Hop Chamber Actually Does

The hop chamber holds the hop rubber against the BB and applies the backspin that makes an airsoft gun shoot flat rather than dropping away at twenty metres. It is the single most important part in the gun for accuracy, and it is also the part most likely to be a cheap moulding on a budget AEG.

When To Replace One

Chambers crack, and worn ones lose their grip on the barrel and the rubber, which shows up as shots wandering left and right for no obvious reason, or as a hop setting that will not stay put between games. If you have chased inconsistency through barrels and BBs and got nowhere, the chamber is usually where the problem was.

What We Cannot Tell You

Rocket do not publish a detailed sheet for this part, so we are not going to list compatibility beyond M4 and M16 pattern, and we will not claim what is in the box. Ring the shop with your gun and we will check it against one on the shelf.

Fitting

Not sure whether this is the right part for your gun, or would rather someone else fitted it? Our Rochester workshop services and upgrades AEGs in house, and we would rather check compatibility with you first than have you order twice.

General
BrandRocket (SHS)
Other
TypeHop up chamber
MaterialPlastic
FitsM4 and M16 pattern airsoft AEGs

Frequently asked questions

What does a hop up chamber do?

It holds the hop rubber against the BB and applies backspin, which is what makes the BB fly flat instead of dropping. It is the most important part in the gun for accuracy.

How do I know if mine needs replacing?

Cracks are the obvious sign. The subtler one is inconsistency: shots wandering side to side, or a hop setting that drifts between games because the chamber is no longer holding tension.

Will it fit my gun?

It is for M4 and M16 pattern AEGs. Beyond that we would rather check yours against one in the shop than guess, because chamber fitment varies between manufacturers.

Does it come with a hop rubber?

Rocket do not publish what is in the box and we are not going to guess. Ring us and we will open one and tell you.