Maybe some experts with red dots or even regular scopes can answer this. We received the cable slide for mine sons jackal. BTW, quick and prompt service from Barnett. We put the slide on per instructions easily. Afterwards, we shot some arrows. Now the odd part, the dots were already sighted in at 20, 30, and 40. The 20 yard dot was still dead, but the 30 and 40 yard dots were several inches high. We actually had to use the 2nd dot at 35 and the 3rd dot at 50! Previous sighting was done with my range finder as was the second time sighting in. Do the think the cable slide was able to increase the FPS that much? It will work for us, but I found that strange the slide was able to gain that much FPS.