I noticed Engel Ballistic Research makes non-cycling and cycling subsonic ammo. However the cycling seems to be available for LEO and Military only. Is that a voluntary restriction, or is there some sort of restriction I'm not aware of on that? My M6A3 has a "suppressed" setting and I kind of wonder if the non-cycling ammo has a better chance of doing what it's not supposed to do with the firearm set that way w/ a can on the end. Anyone?