When I first started making floorplates, people asked me about making a solid brass 140mm floorplate, hoping to get more weight and better magazine ejection. “Too expensive,” I said, “plus the brass will damage the mag flooplate lips.” We were looking forward to the Clinton Crime bill back then, so any potential wear on a high-capacity magazine wasn’t a good idea. We settled on Delrin (back when it was cheap! Now it’s four times the price of aluminum bar!), and that was history.
Flash forward 10 years, the Clinton Crime Bill is history, and new mags are just $25. Brass is still expensive (much more so, in fact), but we’ve decided to give these a try.