Originally Posted by melkson
looking at the pics of the mag, it appears that the FS rounds are rotated 90* to the left midway down the front of the mag. This would allow them to do a 180* turn at the bottom of the mag and come back up the rear of the mag. 15-20 rds is my guess. Alot like the old RAP4 mags, but for First Strikes. As I recall, RAP4 showed a similar mag design in one of their videos as an additional type of dmag they were planning to produce.
Are you saying that based on the presence of that almost helical looking rib?