To date nobody has seen the gun or ammunition since police took it from the shooting scene. The case is near court and nobody is concerned if the gun was defective. The legal focus is the sale of the ammunition. Here is what is involved to review a case history. You need ALL of the paper work.
Testimony can cover thousands of pages.
If you want a copy you pay for it. That can run from several hundred to several thousand dollars. Just right there you can see why the armchair experts have a problem documenting much of anything. A summons and complaint filed in a civil case may mention the gun or ammunition used. That is a poor legal move, but it can happen.