Features
Full Metal Housing for maximum durability
Hopup rubber packing included
Fits all M4 hopup rubbers
Adjustable hopup dial
Fits all metal bodies. (Excludes KWA metal body)
Designed to replace a stock plastic or damaged hop up unit in your M4 variant AEG.

Manufacture: OEM: A&K / CYMA / JG
 
Compatibility:Matrix, Dboy, Echo1, JG, Classic Army, G&P, G&G, SRC, AGM, Tokyo Marui, VFC and other m4 / M16 series Airsoft AEG.
Note: This product will work with plastic body AEGs however some modification is required. Professional installation is highly recommended.