Sorry it took me so long to get back to this thread. Well I took my Spikes M4gery out for a run with the M4 SD II comp installed. Let me say that I tried the Battlecomp 1.5 and wasn't really impressed. I fired 300 rounds the other day at the range and the M4 SD II did just as I expected and wanted. Muzzle rise was not even present. I was able to fire multiple shots as fast as I could pull the trigger and I was amazed how easy it was to keep the muzzle in the same position for each shot. This meant the grouping was extremely tight. I left my cell phone at the house but I will be going back next week and will be sure to get some photos. I know the Battlecomp has a lot more users and is by far the most popular comp out there. There was a definite reduction in muzzle rise with the Battlecomp 1.5, just not as much as I was hoping for. The 1.5 was also quite a bit louder than the M4 SD II. All comps are going to be louder than a A2 Flash Hider, but the M4 SD II was the most quite and the lest amount of muzzle rise. Between the two I prefer the M4 SD II over the Battlecomp 1.5. As I said before, it isn't as widely used as the 1.5 but everything that I found praised the M4 SD II just as I am. Now I want to try the Spikes Dynacomp and I will report back as to how well it does compared to these two. I may soon have a 1.5 up for sale, but the M4 SD II is staying on that rifle!!! I hope this helps some of you.