You'd think with the cost of those things someone would make replacement mag bodies, followers, and springs.
Your jamming problem is probably due to a weak spring (could be worn feed lips too), if you can figure out how to get the spring out without destroying the mag check with Wolff GunSprings, www.gunsprings.com, and see if they have anything that will work as a replacement.
If you find replacement parts let me know, I've got some of these that will probably wear out in the next few years.