Complete upgrade set VSR rolls for-10 from SHS. Set contains stainless steel seamless cylinder (SUS304) which has been welded at the rear for maximum durability. Steel fixing bolts are still co mmonplace. Brass cylinder head has an elongated nozzle and taper for better air flow. Construction of hybrid piston is totally different from the serial pistons used in basic rifles. As is already evident from the photograph the piston is not only one piece, but it is composed of several separate functional parts. Roughly speaking, it consists of duralumin Lightweight body, stainless steel and capture most metallic piston head with the bearing. Steel Spring guide with an outer diameter of 7 mm is also equipped with an axial bearing which prevents unwanted twisting of spring and slightly increases the performance of weapons. Set includes a thicker type of spring to achieve the performance of 130 m/s.
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