Re: Defiance mis-firing. Anyone else had this issue?
I'll make an attempt here to be as terse as possible. It's not possible to deliver anything (regardless of whether we're talking about a manufactured product or growing tomatoes) consistently without the ability to grade what it is that you're making.
In order to know if you're making something (like a receiver, bolt, firing pin, etc.), the exact same every time you make it, you should be able to measure (in the form of metrology) what you've made to ensure that it conforms to an identified set of specs and tolerances (provided that you've actually gone through the trouble of developing drawings, specs, tolerances, etc.), to judge yourself by in the first place.
I would challenge anyone to find any two (far less than 1700) of what we're discussing here to measure the same twice in a row....but of course, there would have to be a spec to measure it to.
Speaking to anyone in particular (aforementioned) will not change the fact that metrology doesn't exist within the organization (other than a granite table, a height gauge and a few gauge pin sets, any hobbyists has this stuff) and anything stated by these individuals will not be based on them having the knowledge of what they're measuring....because they're not effectively measuring anything. Instead, assumptions are being made that parts are coming off the machines in a state that they'll be somewhat functional after a lot of hand-work; so how can their information be credible?
Light strikes have occurred for numerous reasons....