Polished stainless steel cylinder type M16 from SHS. Horizontally grooved cylinder for barrel longer than 490 mm. Due to the longitudinal grooves on precision CNC machines with increased outer surface of the cylinder and this leads to a better removal of unwanted heat generated by friction of the piston head on the cylinder wall. The inside of the cylinder is smooth and reduce the friction of the piston head in the cylinder, thereby achieving a higher compression of cylinder set and thus higher performance. SHS cylinders have no any other post-applied layer, in which is the danger of undesired uneven coating or exfoliation/abrasions. We recommend use with the corresponding SHS piston head, cylinder head SHS and nozzle SHS, which it achieves the best possible results of tightness. Unbeatable price/performance ratio.