I had plenty of magazines for me, but I have two boys, so they ordered some PMags. However, I realize that, on average, I go through a PMag a year in competition, meaning they are unreliable, cracked or otherwise damaged. So the boys also bought a few each of the AR-Stoner/C-Products stainless steell mags and Lancer AWM mags. These mags are more durable long term and can be left loaded indefinately. In addition, the AR-Stoner/C-Products (20, 30, 40) can be easily made into .450 Bushmaster mags holding 8, 12 and 15 rounds repsectively.

So if your kids are buying mags, you might recomend to them that they consider the AR-Stoner/C-Products mags and maybe a few Lancers as well.