UMAREX/VFC MP7 AEG gen1/gen2 spring PROGRESSIVE VARIABLE PITCH for 7,4V battery <1J - TMMP7PVP

PVP spring specificly made to be used with LiPo 7,4V with energy output <1J. Due to the
nature of the platform, it's mandatory to utilize only 7,4V LiPo battery if you need to stay
below the 1J limit energy output to avoid piston-midlenght-engage with this specific spring.
Born from the collaboration between TopMax Elaborazioni (for dimensional specifications)
and Pirani Springs (O.E.M. and technical consultant), the PVP springs (Progressive Variable
Pitch) are Made in Italy and are sized and tested using the double bearing on the spring guide
and under the piston head on 300.00mm inner barrels. The line of PVPs and RCS_it springs of
TopMax Elaborazioni is entirely realized by Pirani Springs on our specifications to combine two
brands of excellence and quality of Made In Italy in the AirSoft world.

TECH TIP: We strongly recommend to install the 4,5mm DELRIN thickness inside the piston.
This spring comes with n°3 DELRIN thicknesses in three different heights to better achieve your
desired energy output.
Technical specification of the UMAREX/VFC MP7 AEG gen1/gen2 PVP spring:
Spring length – 110.00mm,
Spring outer diameter – 14.30mm.
Treatments:
Pre-hardening treatment of steel,
Browning,
Grinding on the ends (for perfect complanarity with the guide-spring and piston head bearing surface),
Progressive variable pitch of the turns,
Thermal stabilization treatment of the product.
We recommend using the spring in the configuration with a bearing on the spring guide and one under
the piston head, to achieve the indicated performance and keep the duration as constant as possible
over time.