The mag pictured in that pouch is a Glock neutered 10 rounder which means a hicap will fit just fine because they are the same size. This pouch is also more secure in terms of not losing your extra mag. The first time you lose a $50 - $100 hicap Glock mag because it fell out of a less secure mag holder, you'll cry.Radamanthus said:Just get the Kel-tec spare magazine holder. You just have to pull the mag out, and you can put hi-caps in it also.