Maple Leaf 6.04 Crazy Jet Inner Aerodynamic Barrel for Marui / Stark Arms / WE / KJW GBB Pistol (138mm) Category_AEG M4A1 Carbine The 19mm cylinder provides the

The 19mm cylinder provides the M4A1 CQBR BLOCK1 a strong and fast blowback recoil

Tokyo Marui SCAR-H Recoil Shock AEG (Dark Earth)

This is just resembling the automatic feature of SPAS 12

-- Metal Hop up version

-- Tan Color Version

Maple Leaf 6.04 Crazy Jet Inner Aerodynamic Barrel for Marui / Stark Arms / WE / KJW GBB Pistol (138mm) Category_AEG M4A1 Carbine The 19mm cylinder provides theSuitable for Marui SA WE KJW compatible GBB pistols 138mm Length (G17L , WE Desert Eagle. 50 GBB) 6. 04mm~ Inner Diameter Pressure diverting design, openings in stainless front sleeve divert high pressure gas, surrounds actual barrel opening to guide exiting BB along its flight path, resulting Copper Build Material < All Available Length >