Seems like a read a story about LE's were to have their duty weapon with heavier trigger pulls to avoid an unnecessary or accidental discharge or the extra time to think about what is going to take place. It's been a while since that read.
I think their magazine is to prime your firearm.
I had the same issue with the Ronin 45. I carry with one chambered and a spare magazine that really hold 9 rounds. So maybe it's by design.
Seems like the big box stores can't get primer or I'm always too late to buy them. I have had better luck at finding primers of all sizes at the mom and pop shops. Big city life.