The OHWS contract was awarded to Heckler & Koch for their MK23 Mod 0 pistol, and Colt scrapped the project.
The handgun was designed to carry a removable sound suppressor and a laser aiming module (LAM).
Colt used the rotating barrel locking system from the All American 2000—one of the strongest locking systems designed for handguns; a double-action trigger with de-cocker, and hammer from the Double Eagle; and the manual safety and firing mechanism from the M1911A1, though adjustable and producing much less recoil.
An interesting feature of the Colt OHWS was mounting muzzle attachments was done through the frame instead of moving barrel; they did this by adding an extension rail and toggle switch.
Colt added in an additional rail under the dust cover to attach tactical lights or LAMs.