Adjustable 2 Piece 30mm Mounts

I recently purchased a Theoben MFR in .20. It was tuned to run on the Beeman Kodiak heavies. Knowing that these were those I bought four tins. Should have bought 8! Exceptional shooting pellet. They were also great shooters out of another .20 cal rifle I have. A custom Lothar walther barreled Crosman. So far only shot out to 50 yards. Went through a full tin in only three days of shooting.