This is a Colt DEA 635 "visual clone," designed to work with a wide range of 9mm and .22LR silencers already in wide use. All components are off-the-shelf or can be easily made on a lathe or with even a hobbyist-level CNC machine.
Below are other examples of work I've done, both physical products and in CAD, including Colt Advanced Combat Rifle stock and barrel, Colt LMG parts, folded ammunition, and AAI ACR flechette ammunition. Click on the images for labels.