This is high quality Mk1 Bull Barrel Black Heavyweight Airsoft Gas Gun from Marushin. It is Fixed slide gas gun that fires in double action (does not blow back).
KJ Works MK 1 The Pistol Place
Starmruger MK1 022104 Normal ABS Silver (Gas Gun Body, 0.2 inches (6 mm) : Hobbies
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Marushin Non-Blowback Bull Barrel MK1 Gas Pistol (Color: Deep Black / ABS), Airsoft Guns, Gas Airsoft Pistols - Airsoft Superstore
Marushin MK1 Bull Barrel Black ABS Airsoft Gas Gun 6mm - Airsoft Shop Japan
KJ Works Ruger MK 1 World of Replica Air Pistols
Marushin Star Mugler MK1 normal barrel ABS silver Airsoft Gas gun - Airsoft Shop Japan
Marushin Non-Blowback Bull Barrel MK1 Gas Pistol (Color: Silver / ABS), Airsoft Guns, Gas Airsoft Pistols - Airsoft Superstore
Catalog Airsoft Guns, PDF, Revolver
Marushin Non-Blowback Bull Barrel MK1 Gas Pistol (Color: Deep Black / ABS), Airsoft Guns, Gas Airsoft Pistols - Airsoft Superstore