Nobody drifted the thread........??....OK. Well......heres a couple more things I noticed then
Most of my life among handguns I spent with LE. My family.....all of them, were NYPD or Nassau County PD. Then I spent 20 years working Investigations and now 4 years as a criminal Magistrate. And I noticed that, generally, LE conceals their guns with no fuss. On the occasions they need to. Whereas non LE seems to over think the whole thing.
Since LE is generally not required to conceal their guns, depending on policy and assignment, maybe they just learn that you can conceal any size gun. You just get a premium belt, holster and dress around the gun. The only guys I ever saw not do that were the Vice/Narcotics, UC guys. Because their assignment dictated it. Only good guys use holsters. The miscreants know that. So if your job is to pass for one of the miscreants, no holster for you. And UC Officers use guns not normally associated with LE.
The State once sent 3 of us for a course on plainclothes handgun training. Very interesting and I learned a lot. But the Chief Investigator told me I would never do UC work, because I look like a cop.
Anyways, there are some limits to what you can conceal, based on your physical build. If you are 5 foot nothing and 110 soaking wet, folks are going to see that Sig 220 or Glock 21 printing. No matter what you do. Perhaps a compact 245 or G30S carried IWB will work better. IF you are trying to conceal it. A lot of the non LE that come in the shop don't seem to want to.
I won't get into the whole open carry thing here. I will leave that for the folks in that quagmire of questionable advice known as the "CCW" section.

Suffice it to say, I am not a fan. IMO it makes you a target. Homey wants a gun. He can't legally obtain one. So, he will take yours that is in plain view on display. Me? I want him and his fellow travelers to be surprised that I have a gun. So, I conceal it. And at 6 foot 1 and growing to 240 in retirement

I carry IWB. And I routinely conceal full size (4506-1/4566/HK USP45) guns in a quality Galco holster. Pancake holsters work well too. Except under a golf shirt.
Ammo selection. Who ever said that RIP ammo was worth a damn? Not only is it worthless, it is EXPENSIVE! We get $2"a round for that junk. If I want fragmentation, I will get a grenade. Penetration and expansion are desireable. Nuff said. Well, except that if you come in wanting a box of RIP ammo, please do not wear your Afghan boots. You couldn't find Afghanistan on a map and likely can't spell it. We don't think you are an operator. Thanks!
And finally, the whole "empty chamber" thing. Let me get this straight. You don't carry with ome in the chamber because "....its dangerous!" Well....if my gun wasn't dangerous, I wouldn't want it. And yes, I know about the Israelis. And you ain't from Tel Aviv. You will not have time to rack the slide. Because you will likely be surprised that you are involved in an unfortunate incident (ie 2nd one to know you are in a fight). And probably using your off hand to fight with your attacker. And in 20 years in Investigations the thing I heard the most from survivors of violent crime was "It happened so fast!".
Working at the local range I disarmed an average of two people a day. These were folks.....wearing Afghan boots

who could not or would not read the signs on the door and in the lobby, which were 6 ft x 5 ft and said; "DO NOT UNHOLSTER OR UNCASE YOUR HANDGUN IN THE LOBBY".
Almost 90 percent of these guns were striker fired plastic. And every one of them had a loaded mag and nothing in the chamber. Every one of them. Dead men walking, IMHO.
If folks are not comfortable carrying a semi auto with one in the chamber, ready to defend their life, they should either seek out competent training, to enable them to do so, or seek out another platform. Like a revolver or a TDA pistol with a manual safety. I was stunned at the number of folks wandering around out there with empty chambers. You would be too. If you know someone like that, help them. You may be saving their life. Seriously. Regards 18DAI