Just dropped a WA double stack SVI 33 round mag from about 2 feet onto a hard carpet and the bottom cap that holds all the springs in snapped in two. I checked on redwolf, WGC, and UNComapny and none of them have anything but plastic replacments. I thought I saw somewhere where they had CNC'ed aluminum ones for sale.
I thought the bottom cap was just asthetic like on KSC glocks so had no worries about it breaking, but now that I saw that its a vital part of the mag I kinda want something heavier duty than plastic.
This is the plastic replacment part on WGC
here