This PolarStar Fusion Engine Red Nozzle allows you to regulate your maximum FPS output based on your barrel.
FPS Range: 500-590 FPS
Complete Nozzle Chart: Click Here
Types of Nozzles Available: AK, A&K Masada/ SR25, G&G SR-25, M4
The following is a diagram showing the approximate FPS output of the red nozzle corresponding to each of the following barrel lengths with .20g BBs at max input pressure 120PSI based on a stock barrel.
275mm will yield ~500 FPS
375mm will yield ~550 FPS
509mm will yield ~590 FPS
Disclaimer: Actual FPS results will be determined by your specific build. Shorter & Larger Bore Barrels will have lower FPS than Longer & Smaller Bore Barrels