Licensed from Gemtech, Madbull has created an identical GM-45 suppressor for both airsoft pistols and rifles. This barrel extension is designed to use 6 mm caliber BBs and has a highly durable T6-6061 aluminum construction. With the black matte finished and Gemtech unique logo, this barrel extension brings a unique look on your airsoft rifle build. This barrel extension not only looks amazing on your pistol but can definitely increase the sex appeal of AEG's with it's thicker cylindrical build opposed to its 9mm counterpart.