I noticed this evening when I did a Search for "SRM", that among the results were 2 different listings for the "SRM Carrier turret". One has a picture (20-623MT), while the other one (20-623TRT) doesn't. I thought this little guy was only a 2-piece mini? ??? I'll admit that I've never put any together, and while I have several of them, none of them are MIB. I'm Hoping Speck can enlighten me as to what the 20-623TRT piece is. Anyone with sufficient knowledge is Welcome to chime in also, of course. O0