Specter Upper receiver set.
Metal YHM Upper Receiver, Includes inner barrel and hop unit. Design to be "hot swappable" with the Specter lower receiver.
The Specter Modular Weapon Systems is the first truly flexible modular system for Airsoft rifles. The Yankee Hill Machine Co., Inc. (YHM) licensed system is made and distributed by ActionSportGames®,Denmark.
The Specter Modular Weapon Systems gives Airsoft players the flexibility to customize their AEG’s to fit any type of game – be it CQB, speedball or long-range sniper games. By simply changing the upper receiver, players can customize their AEG’s enabling them to play with their preferred type of AEG in every game – taking the game to a whole new level.