Airsoft Masterpiece Aluminum Advance Frame - STI - Black Railed The inner diameter of the

The inner diameter of the Airsoft Surgeon hop up bucking is smaller and tighter than any existing hop-up rubber

Ball Bearings Spring Guide

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

- Included 500 rounds AK74 Hi-Capacity Magazine

Quick Detachable Design  Easy hook up

Airsoft Masterpiece Aluminum Advance Frame - STI - Black Railed The inner diameter of theProduct Brand: Airsoft Masterpiece Product Code: F ST39DS Weight: 90g Material: Aluminum