Hop-Up chamber Upgrade Parts. This One-Piece Metal Chamber Set is more durable and accurate in feeding BB. Improves Firmness of the chamber & stabilizes the muzzle velocity. Enhanced Hop-Up bucking for accuracy. Suitable for M4 / M16 series airsoft electric gun AEG gearbox (Version 2). Fit tightly to the barrel base to keep the chamber being centered. Unlike stock plastic chamber which would bend & de-shape, this metal one give you rigidity. Require expert on installing into stock AEG. Upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed. Weight(Gram):42
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