Quote from SPQR-476 from this thread. >
Link.
"There has been some confusion about MCT, also. FDE, the original tan color in magazines, provides some challenges due to the nature of the colorant in thin magazine wall stock thicknesses. It works just fine in furniture, but it was always a hair weaker than black in mags, and difficult to QC for that purpose. Every once in a while, you'd get one that was significantly weaker. That's why we discontinued it in favor of the "sand" color program. Sand uses a different material additive package to be stronger than black, and MCT, the new, darker tan, is based on the sand material. MCT is as strong or stronger than black. MCT was what was used for all of the USMC test mags, including the cold weather drops. Black was used in earlier testing. Both window and non-window variants have been in the government testing, performing identically within statistical significance. With the bulk of the USMC fleetwide fielding orders filled, and the US Army on a sustainable path for fielding, you will see MCT in other mags now, first up being the 20rd LR/SR .308 magazines."