Daewoo Precision Industries K5

[1] The pistol features an unusual "fast action" trigger mechanism which allows the hammer to be decocked while still keeping the mainspring compressed.

A light pull on the trigger causes the hammer to flick back, after which the pistol would behave in conventional single-action mode.

It was reintroduced to the U.S. market through collaboration between Daewoo (now SNT Motiv) and Lionheart Industries of Redmond, WA in 2011 as the LH9, LH9C, and LH9 MKII (amongst other variants), featuring numerous updates including a redesigned hammer, wider slide serrations with added serrations to the front of the slide, redesigned grips, Cerakote finish, and optional Picatinny rail (as the MKII).

The REGULUS was made in the United States, not imported, as was the case with prior models of Lionheart pistols.

The REGULUS built on the LH9 by adding Novak sight cuts, an accessory rail on the dust cover, and an overall change of the pistol's aesthetic.