119'r, I use three different CAD packages that plug into SolidWorks. Very powerful software. I can draw a piece in 3D on my computer, assign tools, model, rotate and check for collisions. Save out in G-code, send to a CNC machine of the proper flavor and parts start stacking up. I mostly design and cut custom automobile and motorcycle parts in billet aluminum. Just have to remember to underside the stuff going to chrome shop so thickness of chrome does not cause fit issues. I have to fudge for chrome and powdercoat or go a thousandth over if it is going to just get polished as it shrinks. I have acquired a few chamber reamers and other rifle building tools. When time permits going to take a stab at start to finish rifle from scratch. Since I can do carbon fiber too will make the mould and lay my own stock. Right now I have three antique motorcycle restorations sitting in line. May be a while before get to a rifle. I have been building my own Title 1 supressors. All I do is send the feds their 200 bucks and scrounge a little scrap out of the pile and free supressors take a couple hours to build.