odd, I can't seem to remember the ccm site or find it. eh well they both do the job the same way. if you happen to find it, there may be a few sizes. midrise, highrise and no rise. they're different heights. if you have a nice, forcefed hopper pick up the no rise or midrise. with bushmaster/promaster/bko/ICD threads.(or any single one of those words)
Here is the AKA site link. get the bushmaster one.
AKA Paintball