APS is now re-launching the Mk. I system, they call it CAM Mk. III. Mk. III is an improved version of CAM870 Mk. I, it is still using push pin system, but internal is modified to make sure no real gun parts or shot shells could be used. The body receiver and its cradle are re-design, so that baddies can't interchange them with real shotgun parts.

With the help of extended push pin, CAM Mk III could give you 330 FPS, it is more powerful than the old Mk I system. CAM Mk III shotgun are 100% compatible with Mk I shells and Smart Shot shells. Smart shot shells allow user to fill gas directly through the valve. With the use of either 88 g. cylinder adapter or paintball cylinder adapter, the filling is 3 times faster than the old Mk I system.