I own two Commanders. One in black plain edge, and one in black combination blade. The first one I bought was the plain edge blade which I purchasaed earlier this year. The most recent Commander I purchased was black combo blade which I received today. Of course I compared the two Commanders side by side. I opened both of the knives with edge facing up, so that I could compare how the liner was locking against the back of the blades. This is where I noticed the considerable difference in the liners. The knife that I received today had some type of machining in the right side of the liner where as the older one did not. This machining is just opposite of where the left liner is engaging the blade , and holding the blade in the locked and open position. I studied on the question, what is this?, and came to this conclusion. The machining on the right liner of newest Emerson Commanders is to keep the left liner (the one that engages and holds open the blade)from walking all the way across the back of the blade and slipping off the back of the blade, and accidentally causing the disengagement of the knife. My newest Commander is definitely manufactured with a different liner. Men, check your Commanders, especially the ones that have released recently by Emerson. Emerson knives or anybody that knows what this liner is for, please let me know. Thanks, David