Wow! a Detonics Combat Master. This is the pistol that pretty much created the "micro" 1911 niche with its 3" barrel and bushing-less design. It is basically a chopped down 1911 with some modifications to make the timing and action work in such a shortened version of the original JMB design. It uses a multi-spring captured recoil rod to handle the stout .45 ACP recoil as well as doing away with the barrel bushing in favor of a bell shaped barrel muzzle to fit into the slide. Another prominent feature is the relocation of the rear sight to just behind the ejection port and the removal of slide material to form a gentle slope leading back to the hammer. This was to facilitate the carrying of the weapon in "condition 2" with a hammer down on a loaded chamber and the rapid "cowboy" cocking of the weapon upon drawing. Now, carrying in Condition 1 (loaded chamber, hammer cocked and weapon on safe) is the more preferred method these days but for a "compact" pistol (weighing at 32ozs!) this was workable concept in the 70's.
This style of 1911 is now back in fashion with the passage of CCW bills from coast to coast and the renewed interest of daily carry. Kimber comes to mind predominantly with their CDP line of compacts, but there are other offerings in the market as well. Carrying 6+1 rounds of .45 ACP, while the weight may be heavy compared to polymer CCW choices, the dimensions lend themselves to daily carry.
I did not get to shoot this particular pistol, and only meat pawed it for a few moments. Still it was a nice run in with some quality steel.