When a certain now famous (in those circles) narrator was first getting started he mentioned on his FB page he wanted help with pronunciation of certain military terminology. I offered to help, knowing people in many fields plus my own. And ... my goodness, the absolute poor quality of some the writing he sent me. One author would use the full terminology for every firearm every time he looked at it, picked it up, loaded it, holstered it, drew it, released the safety, fired it, cleaned it, thought about while in the shower, whatever. You got tired of reading about the "Heckler & Koch HK45 Compact Tactical (HK45CT) MK-24 Mod-0" fully spelled out three times a page.

And then the author with his own specialty started writing about my field ... oh so badly.

So, knowledge of weapons doesn't translate in knowledge of writing (or vice versa). My only criteria any longer is just don't say "clip" unless your character has scored himself a Mauser C96 or similar and we're good.