Born from the collaboration with a company that has been a leader in the sector for 30 years, the D105 spring is made of pre-hardened steel with variable pitch.

The abbreviation 105 distinguishes the speed in m / s that can be reached with 0,20gr pellets.

Calibrated on a replica with inner-barrel 6.08 and 220mm in length, using a type A cylinder (for barrels from 180 to 250 mm) with a perfect closure between the shot pusher and the hop up rubber and without bearings or shims on the head piston on the spring guide.

The study of the step, the final length and its realization make the spring soft in the compression phase and fast in the release, ideal for high speed mechanics.

Construction features:

    Pre-tempered steel;
    Stabilization at 400 °
    Ground and self-centering ends
    Shot peening treatment (improves the surface distribution of residual stresses by increasing the fatigue resistance of the treated piece).
    Final stabilization at 200 °
    Pre-settling to guarantee the performance of the spring for life and eliminate power losses with use