![GUARDER Bore-Up Cylinder Set for M16A1/VN](http://airsoftph.com/cdn/shop/products/bore_up_set_m16_{width}x.jpg?v=1569947898)
-The Bore-Up Cylinder Set compatible with M120~M170 Spring.
-Include:
Stainless Bore-Up Cylinder Head
Bore-Up Air Seal Nozzle
Bore-Up Ventilation Piston Head
Bore-Up Chromium Plating Cylinder
-Material: S303 Stainless Steel/Brass/Polycarbonate/Acetal