RetroArms NGRS Spring SiCr with Progressive Wiring – M130

<h5>Retro Arms Spring for Next Generation Recoil System (NGRS) Tokyo Marui Rifles</h5>
<p><strong>The spring is a fundamental part of the <a href=”https://kamaradsvyhodami.cz/en/dictionary/mechabox” target=”_blank”>gearbox</a></strong> because its <strong>strength, along with the air seal, affects the overall performance</strong> of the rifle. Low-quality springs, although they often have above-average performance compared to their rated value, quickly lose their stiffness, shorten, or in extreme cases, can break (due to storing the rifle with a compressed spring or in a pre-cocked state).<br />From the workshop of <strong>Retro Arms</strong>, famous for their <strong>quality CNC gearboxes</strong>, comes another finely tuned upgrade part for Marui NGRS: a high-quality spring made <strong>from valve wire alloyed with silicon and chromium (SiCr)</strong> that retains its stiffness after thousands of shots and does not deform.<br /><strong>Progressive (variable) winding makes the compression easier in the first phase of the piston movement</strong> while <strong>not reducing the performance. The outer diameter of the spring is 13.75 mm.<br /></strong><strong>The rated value of M120 corresponds to a speed of 120 m/s</strong> with an average barrel length. With a <strong>good air seal</strong> or a <strong>longer barrel</strong>, the <strong>performance will be higher.</strong></p>
<h5>Installation</h5>
<p>When installing a spring with progressive winding, the <strong>compressed part</strong> (where the coils are closer together) <strong>goes on the spring guide.</strong> <strong>Retro Arms marked this spot with color</strong> for easy <strong>identification of the spring strength (see below).</strong></p>
<h5>Compatibility</h5>
<p><span>This spring is compatible only with <strong>TM Next-Generation Recoil</strong> gearboxes (referred to as gearbox v.9) and is not intended for other types of gearboxes.<br /><strong>In terms of length and diameter, it matches the springs of VFC Umarex MP7 AEG and LCT QM</strong>,..