I saw this several years ago at the SHOT Show and it looked very interesting. It looks like Defiance setup manufacturing in the US to be able to sell the silencer in the United States.
Nyon, Switzerland (July 2012) – DEFIANCE®, a manufacturer of optimized accessories for operators and professionals, announce the release of the first DEFIANCE® Suppressor designed for the use with the KRISS® Vector family of firearms and is compatible with all KRISS® SMG, SBR and SDP firearms (supports M16x1 LH threaded .45 ACP models).
The DEFIANCE® HPS 4GSK Cal. 45 ACP incorporates an internal baffle system consisting of two steel and three aluminum baffles strategically stacked to minimize sound and maximize suppressor service life.