This Essential part for Replace Your Airsoft Electric Gun Original Hop Up Chamber This One-Piece Chamber Set do not increase the muzzle velocity or rate of fire but it increase the durability of your gaerbox Plastic Construction Also, fit tightly to the barrel base to keep the chamber being centered Includes all parts needed for installation Suitable for M4 / M16 Series Airsoft Electric Gun AEG Gearbox (Version 2) Require expert on installing into stock AEG
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