CYMA One Piece Metal Hopup Chamber Set for M4 M16 Series AEG

Designed to replace a stock plastic or damaged hop up unit in your M4 variant AEG.

Specifications

• Full Metal Housing for maximum durability
• Special cut in the front makes the tappet get back more when operation.
• Hopup rubber packing included
• Fits all M4 hopup rubbers
• Fits all metal bodies. (Excludes KWA metal body)