Spring SP 100 [Guarder] with uneven pitch for AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. Equivalent to 100 Systema. The assembly of this spring provides the outlet power in the range from 330 to 360fps (the muzzle velocity depends on other parts installed inside the gearbox).
Spring SP 110 [Guarder] with uneven pitch for AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. Equivalent to 110 Systema. The assembly of this spring provides the outlet power in the range from 360 to 390fps (the muzzle velocity depends on other parts installed inside the gearbox).
Spring SP 120 [Guarder] with unequal pitch for AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. Equivalent to 120 Systema. The assembly of this spring provides the outlet power in the range from 390 to 420fps (the muzzle velocity depends on other parts mounted inside the gearbox)
Spring SP 130 [Guarder] with unequal pitch for AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. Equivalent to 130 Systema. The installation of this spring provides a muzzle power ranging from 420 to 450ps (the muzzle velocity depends on other parts installed inside the gearbox).
Spring SP 140 [Guarder] with unequal pitch AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. Equivalent to 140 Systema. The installation of this spring provides a muzzle power ranging from 450 to 480fps (the muzzle velocity depends on other parts installed inside the gearbox).
Spring SP 150 [Guarder] with unequal pitch AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. Equivalent to 150 Systema. The assembly of this spring provides the outlet power in the range from 480 to 510fps (the muzzle velocity depends on other parts mounted inside the gearbox).
Spring SP 160 [Guarder] with uneven pitch for AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. The assembly of this spring provides the muzzle power in the range from 510 to 540fps (the muzzle velocity depends on other parts installed inside the gearbox).
Spring SP 170 [Guarder] with unequal pitch for AEG tuning. Both foreheads are ground. Suitable for AEGs, except PSG-1. The installation of this spring provides a muzzle power in the range of 540 to 570 fps (the muzzle velocity depends on other parts installed inside the gearbox).