> I do IDPA matches

Yes, this is the level of training I imagine as sufficient. A match applies pressure: you're on a clock, there is an audience, you have a safety regime and people scrutinizing you on it, and at the end, there is a score. I don't claim Fort Benning sniper school is necessary. Only that you likely can't just wander out of a gun shop with your scoped deer rifle at any price and snipe targets at range under pressure: there is more to it than the weapon.

> Combat trained random people are probably more common than you think.

I listed a wide variety of people with the training I believe is sufficient.