Guarder SP110 Spring

PIRANI SPRING TOP 90

Springs made in Italy, with ground and self-centering support surface, spring force identification color. Anti-corrosion treatment, variable pitch spring. Made with pre-hardened steel. The springs were tested on a modified VFC M4 with two bearings, normal stroke, 270mm barrel, exhaust hop up and 0,20gr pellets, giving the values expressed by the spring

ATS SPRING X90

Magic Box M100 molla in Acciaio Armonico

The Guarder SP130 Harmonic Steel Spring is perfect for high-power setups with an incredibly rapid release.

PIRANI SPRING BASIC 90

Molle made in Italy, con superficie di appoggio rettificata ed autocentrante, colorazione identificativa forza molla. Trattamento anticorrosione, molla a passo variabile Costruita con acciaio pretemprato. Le molle sono state testate su VFC M4 modiifcato con due cuscinetti, corsa normale, canna da 270mm, hop up scarico e pallini da 0,20gr dando i valori espressi dalla molla

Spring RCS Top Max

The central stabilization narrowing allows the spring to maintain a more linear and rectilinear position inside the air unit, minimizing lateral displacements and maximizing the life span of the spring, moreover the constant performance of the RCS spring allows to obtain a firmer shot. 

90 m/s FPS spring has been calibrated on 363 mm inner barrel and gearbox with type D cylinder (for barrels from 301 to 400 mm).
Of course with shorter or longer barrel the performance will decrease or increase, therefore the calibration will be harder or softer