1. DA/SA with "safe" position and control lever (manual safety/decocking lever) on left side of frame
2. DA/SA with "safe" position and control lever
Variants 1 and 2 allow the user to carry the pistol in a single-action mode (cocked and locked) with the manual safety engaged. This same pistol, without modification, can be carried in double-action mode, with or without the manual safety engaged.
3. DA/SA without "safe" position with control lever (decocking lever) on the left side of frame
4. DA/SA without "safe" position with control lever (decocking lever) on the right side of frame
Variants 3 and 4 provides the user with a frame-mounted decocking lever that does not have the "safe" position. This combination only allows the hammer to be lowered from SA position to DA position. It does not provide the "safe" position to prevent the pistol from firing when the trigger is pulled.
5. DA-Only with "safe" position and control lever (manual safety) on the left side of frame
6. DA-Only with "safe" position and control lever (manual safety) on the right side of frame
7. DA-Only without control lever (no safety/decocking lever)
For the DA-Only user, variants 5, 6, and 7 of the USP operate as double action only pistol with a bobbed hammer always returning to the DA position (forward) after each shot is fired. To fire each shot the trigger must be pulled through the smooth DA trigger pull. Variants 5 and 6 have a manual safety lever.
No control lever is provided on variant 7.
9. DA/SA with "safe" position and control lever (manual safety) on the left side of frame
10. DA/SA with "safe" position and control lever (manual safety) on the right side of frame
Variants 9 and 10 allow the user to carry the pistol in a single-action mode (cocked and locked) with the manual safety engaged. Unlike variants 9 and 10 [sic], the control lever can not be used to decock the hammer. These variants are the ideal choice for users who prefer shooting the pistol in SA mode with the thumb placed on top of the manual safety. This same pistol, without modification, can be carried in double-action mode, with or without the manual safety engaged, and provides second primer strike ability to single-action shooters.