Not making anything, only want to be able to inspect. Just spent an hour looking online for blueprints. Watched a School of the American Rifle YouTube where a bolt and carrier that wouldn't function was found to be out of spec just about everywhere. Parts were "pinned" using go, no-go gauges. Looked like a standard inch pin gauge set would work fine if you knew what the dimensional call-outs were (.xxx", +.xxx", -.xxx"). A link to or a copy of a blueprint anyone?