Maruyama ISO556 GBBR (Dual Mag Version) l85 01mm inner barrel is hard

01mm inner barrel is hard oxidized to increase the surface hardness to a point where it won't wear anymore

and dominate the competition with every shot

plastic button:Nylon

360° Rotational brass threads

Maruyama ISO556 GBBR (Dual Mag Version) l85 01mm inner barrel is hardThe ISO556, a product of Swiss engineering and innovation, was developed in the 2000s as a modern, budget friendly line of Assault Rifles, SMG, and Battle Rifles produced in various calibres. It incorporates well considered, time tested features, utilising contemporary materials and modern manufacturing processes. This firearm boasts numerous attributes that appeal to shooters, providing an economical alternative to the increasing demand for carbine