Just to clarify, the 8 3/8" compensator for lead still has top vents, in the form of a large oval top hole, to provide relief from vertical recoil. This compensator extends a little further out from barrel than jacketed compensator which sits flush with barrel housing.

The lead compensator still allows gases to go straight up and out (as well as to the sides) partially through the top oval extended hole, instead of going into 6 small top holes and through a portion of barrel housing. Any leading would be easier to clean with compensator designed for shooting lead. This can be used for jacketed as well.