All 6 of my surefire SOCOM suppressors exhibit this. Even on a bolt gun, you can see it. It comes back through the index slot on the MD. This is the only spot on the taper surface that would allow gas to come through. If you are looking at it side by side with say a thunderbeast suppressor with the large taper surface, it does not have an index slot and seals the muzzle device to the suppressor 360 degrees. If the surefire did not have an index slot and the taper mount surface went 360 around, it would not leak any gas out either. Non issue and normal behavior for this system. Keep on shooting.

