I think I'm going to blow up one of my guns because I like one mag. So I have a shit ton of PMAGs loaded with XM193 for the normal bang away with the ARs type stuff. Up next I have 6 lancer mags loaded with good 5.56 ammo for HD use. Lastly I have a bunch of HK mags that I have dedicated to .300BLK, except for one. All of my HK mags are painted except for the one that I use in an M16A4 clone. The .300 mags stay out in the barn but the A4 clone is the primary HD gun and sits around with the one HK mag in it in the house. I love the way the black HK mag looks in the gun and it works great, but I worry that the stars will align in the wrong way and I'm going to put the wrong ammo in the wrong gun.