With the help from CZC doing the machining I just finished putting together a Shadow2 upper on a 75 safety model compact frame. I picked up the frame about 6 mouths ago and wasn't sure what I was going to do with it when a S2 compact upper came up for sale and I bought it. Well like the S2s and TSs the slide does not go onto standard frames. I reached out to Stuart and got the frame and slide over to CZ Custom and had machine work and refinish done and it looked great. I put it back together with some upgrade parts and took it shooting last Saturday. I also took my mildly worked over 75 compact for comparison shooting. Besides eating anything I put in it like 115 FMJ, 124 FMJ, 115 HP and 147 HP it shot really well and I definitely can say it is a step above the standard 75 compact.