Airsoft Masterpiece Aluminum Advance Frame - STI - Black Railed 4V Batteries (Mini Plug) at

4V Batteries (Mini Plug) at your choice ( Battery not included )  Enhanced pistol grip with Heat Sink End Cap avoid Motor overheating and burn out  Opening the bolt cover to adjust HOP UP  Clockwise 14mm is able to attach any barrel extension tube (sil

300 Rounds Hi-Cap Loading Capacity

Quick Detachable Design  Easy hook up

Damage could be caused to the screw thread if screw glue was not used

Aluminum Made 14mm barrel extension tube  Sling mount can be installed with any single

Airsoft Masterpiece Aluminum Advance Frame - STI - Black Railed 4V Batteries (Mini Plug) atProduct Brand: Airsoft Masterpiece Product Code: F ST39DS Weight: 90g Material: Aluminum