Mack Kick was BW Neo toy C-36 and also was in VS-36 with Archadis. Having read up on the toy I'm reminded that Mach Kick and Archadsis are design contest winners in Japan - apparently the horse design was submitted by a child in crayon !
Mach Kick is a black horse, with a hair tail. His fore & back legs bend at knee and ankle, and the forelegs have a ball joint at the hip. The head raises and lowers, and the jaw opens. He's got an attack gimmick in this mode - push down on the back of the mane and the horse's head telescopes forward courtesy of the mane extending. There's a word for the mechanism behind this but I can't think of it right now (help !)
Mack Kick has a sort of attack/battle station mode. I'm unable to find any photos for it on the net, I haven't got the box that shows it and I can't figure out what to do from the far too small Japanese instructions. You'll have to do without me describing it but it's basically Longrack's. But worse.
TF: (here we go) pop the back up, remove the tail. Look at the horse from the side where the horse is facing to your right. The waist is facing you with the strut on top pointing forward and underneath facing back. The leg on top (his right) comes towards this side and down, the leg on the bottom (his left) goes up and back. Straighten the robot legs up by twisting at the knees. Fold the lower legs up into the front of the lower legs. Fold down the heel spurs. Pop the panel connected to the forelegs off it's pegs. Detach the side panels and fold them down behind the robot legs. Turn round at the waist so the arm folded over the chest faces forward. Fold the horses head down to form one arm. Fold the robot head up and turn round. Fold the horses back up onto the shoulder and turn so it's pointing down. Fold the other arm onto the shoulder under the horses back. Turn the horse legs section the other way up and fold onto the back.
(well as usual describing the TF has helped me to reverse it ! Though it all went a bit wrong around the getting the side panels back in place as I'd managed to get them upside down on the wrong sides - the pegs need to be facing down on the horse mode.)
Robot has ball jointed shoulders, a pair of ball joints on his left elbow, on his neck, waist, hips and knees. The horse arm bends at the elbow. The tail forms a sort of whip/hand axe for the robot to hold in his one fist.
Overall: Robot's OK, limited by the horse's head on the arm. Horse is good, pretty well articulated. TF is horrendous - especially back to beast. My abiding view of the toy is coloured by this, your mileage may vary.
There's a few repaints in Mach Kick that haver never been made. The most obvious is a white horse, but also if you remolded the tail so the tail lost the hair and was more like TM Cheetor and then painted appropriately then the toy would make a good Zebra.