The M1 Garand is a clip fed rifle that loads from the top of its reciever and into its internal magazine via an 8 round en bloc clip. If you had 2 or more CLIPS taped together you would have to seperate them (and likely remove the tape) so as to allow the SINGLE CLIP to be placed onto the magazine follower and to prevent the tape from creating an obstruction to inserting it into the reciever.
Sorry, I was talking about the M1 .30cal carbine. Several people suggested it was not a good idea to tape mag’s together one reason being that the one on the bottom would be exposed to all sorts of dirt and stuff and possible jamming.