There are some definite signs that you have the wrong concealed carry gun. Granted, much of what makes for the right concealed carry gun or a good concealed carry gun is totally subjective.
Much of what makes the right concealed carry gun is totally down to what’s right for YOU.
Plenty of folks carry a Taurus G2C. Lots of folks carry a GLOCK 19. Plenty of people are just fine toting a Government frame 1911. (I work for a holster company; I have the sales data to prove it.) You may commence the GLOCK vs 1911 argument in the comments if you desire.
With that said, there are some universal signs that you may have the wrong CCW gun. What are they? Let’s talk about that. Bear in mind that all of these can be ameliorated to some degree, but only so much can be done at a certain point.
Sights you can’t see.

Unless you exclusively use point shooting with your self-defense gun, sights that you can’t easily see are a problem.

Granted, point shooting is a viable combat shooting method up to a point, but it isn’t taught by many shooting instructors for the simple reason that the modern technique tends to work better.
If you can’t see your sights well, you’ll have a harder time with accuracy, and that’s what wins gunfights. We’ve likely all heard the old saw that “Speed’s fine, but accuracy is final.” There’s something to that.
Most self-defense shootings involving civilians – not police officers, not soldiers…civilians – take place up close and quickly. Therefore, you need to get on target in a hurry. If you need to shoot at greater than bad breath distances, tiny or hard-to-see sights can make that harder.
If your sights make a sight picture difficult, that costs time you can ill afford in the moment of truth. This can be fixed in many cases with a set of aftermarket replacement sights, but if you have trouble with the sights on your carry gun, this is a good sign they or the gun needs to be replaced.
The wrong caliber for you

If you find that you don’t shoot .45 ACP very well, then don’t carry a gun chambered in that caliber. If that means you have to ditch your .40 S&W pistol because it’s too snappy, then do it. That may also mean that a gun chambered in .44 Magnum isn’t a great concealed carry pistol for you, despite what you may have seen in the “Dirty Harry” movies.
Besides, he even admits in “Magnum Force” that he actually uses .44 Special because it gives “better control under recoil than a .357 Magnum with wadcutters.”
Say what you want, but this was a contributing factor (not the only one) in the FBI ditching 10mm and why almost all police departments now issue 9mm pistols as their standard duty weapons. Nine is cheap, effective, and easy to shoot, particularly with today’s much more effective JHP rounds.
If you don’t run a gun well because of the caliber, then you shouldn’t carry that gun in that caliber. You can switch to reduced recoil loads, of course (185-grain .45 ACP works very well…so do light .40 S&W loads) but it’s better to have a gun that you shoot well to start with.
Your gun doesn’t fit you
You shouldn’t have to reach too far to put your finger on the trigger face, nor should the trigger reach be too short. Your finger should reach the trigger shoe naturally, without strain or impediment.
This is one of the reasons 1911 pistols have stayed so popular; they’re ergonomically excellent. Ditto CZ pistols. This is also why GLOCKs, with their 22-degree grip angle are so polarizing.
You can make an almost-fitting pistol work, with swappable back straps and thinner or thicker grip panels, sleeves and so on. But a concealed carry gun that fits you right will be one you that you’re more likely to to shoot well, something that’s critical in a defensive gun use situation.
If it doesn’t fit, you should probably quit…carrying that gun.
If you can’t hit the broadside of a barn
You don’t like shooting it

There are plenty of CCW pistols out there that are compact AND pleasurable (or at least pleasurable enough) to handle and shoot. Since the handgun market for civilians is so large – because we’re one of the few countries that deems civilians worthy of carrying a concealed pistol – you can easily find one that you can afford.
It’s like the rest of your concealed carry gear. If your holster isn’t comfortable, and if you can’t train with it, you’re going to find excuses not to carry. If you don’t like your gun, you’re going to find excuses not to train with it.
It takes too much fettling

It’s one thing if you have a target pistol, family heirloom or beautiful barbecue gun that needs extra care to keep it in shooting condition from time to time. If your CCW gun needs too much attention…it’s just not reliable.
You need to carry something you can rely on to work. A gun that goes bang every time you pull the trigger. If your car broke down every other week, chances are you wouldn’t have it for long, either. Do you want to risk you life on a carry gun you can’t rely on?
So, what do you think? Any other telltale signs you have the wrong concealed carry gun? Want to get into the caliber wars or the whole GLOCK vs 1911 thing again? We hope not; that’s been done to death. Sound off in the comments!