SHS Full Metal Hop up Chamber for Maui G&G G&P JG CYMA DBoys KingArms AEG [For Airsoft Only] This One-Piece Metal Chamber Set is more durable and accurate in feeding BB This One-Piece Metal Chamber Set is more durable and accurate in feeding BB Enhanced Hop-Up Bucking for Accuracy Enhanced Hop-Up Bucking for Accuracy Unlike plastic chamber which would bend & de-shape, this metal one give you rigidity