excellent muzzle device
I have this on my direct blowback 9mm AR. I recently was able to compare this to the VG6 GAMMA 9mm muzzle device (a very well-reviewed muzzle device) on my same firearm. The results were that the recoil reduction felt very similar (the VG6 may have been 5-10% better), but this Synergy Mini Comp 9mm 1/2x28 was dramatically better in terms of concussion/blast. I would say this device produced at least 60% less blast than the VG6 produced. That allowed my groupings to be much tighter with this device. In my personal experience, having a huge blast negatively affects rapid follow-up shots (even if the recoil is technically reduced). I believe all the small ports allows this compensator to avoid the huge side blasts (the VG6 GAMMA 9mm has 2 large side ports). This compensator was the clear winner for me and allowed me better rapid 3-shot groupings.