First off I DON"T OWN one of these compensators but maybe we can figure something out together.
Put your bullet down the muzzle of your rifle. It won't fit: correct? But it still shoots fine.
It seems to me that to be effective the compensator must divert as much gas as possible out of the ports. Gas that goes through the final hole (undiverted gas) will increase if there is windage (a gap) around the bullet and so the compensator will be less effective.
In other words it makes sense to me that there is no windage through the final hole.
I think this is why thread on compensators are effective but the clamp on compensators or those held with a set screw are occasionally launched down range. The bullet strikes the hole (and compensator) and the clamp or set screw gives way.
Anyway that's my two cents.
Bookmarks