JimFlat6:
The Russians were way ahead of everybody with the aks74u krinkov,. You can hide it under a coat and it does deliver a pretty good punch. Problem with the wests small caliber pdws is that they don't have much energy left at 100m,which sounds far for cqc but experiences in urban warfare and raids in villages showed that assaulters doing a raid on a building might also have to neutralize enemy fire coming 100m away from enemy overwatch people. You can hit targets at 200m with a krink all day long. Western pdws are really best suited for close in VIP security or police in "friendly" countries. Israel has had a lot of success with the micro tavor which is more compact but it's still awkward to shoot left handed around corners and barricades because of empty case ejection. So my vote is for Mother Russia on this topic.
Depends on what we are discussing here: Protecting your private home or fighting off a group of rebels attacking. 
Seriously: For normal every day protection, a simple gun like a P99 or whatever is more than enough to protect you (if you know how to use it). Weapons with more punch or better range won't help you much inside your house or even in your garden, on the contrary.
People living in remote areas, far away from the next police station and/or a town, should better invest in good intruder protection like heavy doors and solid window frames, even break-in resistant glass and of course a safe room (or panic room) you can easily access fast, even at night (best: directly from your bedroom). Our front door weights 300 kg for example and it is massive wood with a steel core. When you open it, it feels as if you open a vault.
I do not think that having an entire armory in a private house makes the residents safer. This could be a very dangerous illusion.
The US however has a different situation than Germany for example. Last time my wife accidentally set off the (intruder...no siren...it is silent to give the intruder a feel of safety) alarm, the police was inside our living room within the next five minutes, pretty impressive (not so impressive their reaction to the false alarm and the 170 EUR fine I had to pay for that). We have police stations quite close to our residential areas, even outside of cities, so the police arrives pretty fast. I know it is much different in the US, where the police may need half and hour or longer to reach your home.
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RC (Germany) - Rennteam Editor Porsche 991 Carrera 4 GTS Cabriolet, Porsche Macan Turbo, Ford Mustang GT500 Shelby SVT (2014), Mini JCW (2015), Jeep Grand Cherokee SRT (2014)
if they are not specifically trained for the job. 
