However, there are two situations where I find the Glock to be a bit cumbersome. In the summertime when shorts and T-shirt are almost an everyday thing and 7 o' clock at night when the wife tells me I need to run to the store to get something. I am just looking for something I can throw in a back pocket (hooked to a kydex trigger guard holster) and still keep perfectly concealed.
I would like to respectfully challenge your thoughts for the following reasons;
1. Convenience stores (and liquor stores) are a high target for armed robberies. That is the reason LEO’s called them “stop-n-rob.”
2. Armed robberies increase dramatically after dark.
3. Violent crime increases during hot weather.
4. Everything in firearms is a tradeoff. More so with handguns.
5. Smaller means difficult choices. Higher capacity means smaller less powerful cartridge. More powerful cartridges are larger. High power cartridge are more difficult to control in small guns.
6. Quality can be found for less than $300.00 but in what calibers? The Makarov is a excellent buy with a cartridge considered marginal by some but it is well out your size requirement. I have a Star Firestar 9mm+P that comes very close to your size requirement but being all steel it is too heavy for a pocket gun.
7. Humans can be very, very difficult to cause to stop their actions especially quickly.
8. Walking in on a robbery in progress is extremely dangerous with the likelihood of violence increasing.
9. Pocket carry is slow to draw from and telegraphs your actions.
10. Pocket guns still require a holster to keep them from shifting their position.
So when you are making a trip to the convenience store you are going into a potentially more dangerous situation with a lower power low capacity handgun. The robber may well be better armed with a high power higher capacity handgun. Not only that but there may be more than one robber (i.e. wheelman of escape vehicle).
I have a Seecamp LWS that meets your criteria perfectly. But I am under no illusions about it’s stopping power and that it is strictly a last ditch no other way out defensive gun. Most experts agree you are better off dressing around your firearm than other way around.