So I picked up my 3 prong SF flash hider yesterday, and I asked what is the difference between the 3 prong and the 4 prong that wasn’t allowed for civilians. I was told that the 4 prong fit the military SOCOM suppressors and the 3 prong was for the civilian. I was also told that the military one had better suppression, less blow back and less of a heat signature. He said that he shot both and he could tell the difference between the two. Also that the government bought the rights to the suppressors, so that is why the civilians model is not as good. I knew the flash hiders were different but I didn’t know the suppressors were different as well? Is this really true?