I remember these from back in the day but never got bitten by the "I gotta have one bug". looking at the photo I noticed the shortened sight radius so I had to find out why.
"Perhaps the most obvious of these concerned the absence of a grip safety and the sloping contour along the rear of its slide, which lessened the slide’s mass and sped up its shortened travel. The rear-sight assembly was moved forward, closer to the ejection port. Although this decreased the pistol’s already short sight radius, the Combat Master still proved accurate at close range."