CYMA Metal One-Piece Hop Up Chamber Set for CYMA SVD Series AEG GearboxCYMA Metal One Piece Hop Up Chamber Set for CYMA SVD Series AEG Gearbox Made out of metal. This One Piece Metal Chamber Set is more durable and accurate in feeding BB. Improves Firmness of the chamber and stabilizes the muzzle velocity. Enhanced Hop Up Bucking for Accuracy. Fit tightly to the barrel base to keep the chamber being centered. Suitable for CYMA SVD Series AEG Gearbox. Not like stock plastic chamber which would bend and de shape, this