Star Model MD
The model M is a slightly strengthened version of the model A available in 7.63, 9 mm Largo and .32 ACP. It also has a grip safety, as in the original Colt. The .45 ACP variant was known as the model P. In these guns barrel lengths from 75 to 200 mm were available, but the standard was 160 mm. A very standard model P (or PS) is depicted at the right. The model MD was a selective fire version of this gun. Only about 8,000 of the MDs, with detachable wooden stock/holsters (as shown below below) were made.
Picture and information courtesy of: Steven Hoober