My clear Manticore magazine arrived today. Very nice design.
BUT, it drops free just like my OEM 20 and fitted OEM 30's
Bolt closed, empty mag - Drops free fine
Bolt locked to the rear with the charging handle, empty mag - Drops free fine
Bolt locked using the slide release, empty mag - Mag stays in the mag well
Drop free is not the only reason I wanted this mag. I wanted the extra 2 rounds for USPSA PCC stages.
I'm still a happy camper.