The installation ring kit for A&K SR-25 comes with a Delrin spacer which placed at the front of the cylinder of the Fusion Engine so that the version 2 system has the same length as the original elongated gearbox SR25. An M5x0.8mm nut is also included to place on the back of the SR25 so that the original bolt can be screwed to the back of the system. This kit coupled to the A&K SR25 nozzle (purchased separately) allows the system to work with the original M4 type hop-up chamber of the replica.
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Product Details
- Type
- SR25
- HPA System
- Polarstar Fusion Engine
- Material
- Polymer
About Polarstar
PolarStar Airsoft was formed in 2009 as a part of PolarStar Engineering & Machine with the goal of bringing our engineering experience and focus on quality to airsoft. Since then, PolarStar has made innovative airsoft products of the highest quality, designed and manufactured in the USA. PolarStar products, including the patented Fusion Engine are designed by airsoft players, incorporating airsoft experience with the feedback of the commnity.
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