Home Page Brand S&T Length(mm) 667 - 745 Weight (g) 2690 Fire Modes Safe / Semi / Full-Auto Rails 20 mm Picatinny Top Rail Main Materials Polymer Compatible Batteries / Gas N/A Other Info/Specs Gas Blow Back S&T M4 RIS CQB GBB BK£174.95PriceQuantityAdd to CartBuy Now