Re: Need gun advice.
That type of gun was popular in a very limited number of spaghetti westerns, but in real life, the design is simply not strong enough to support an effective defensive round. For a shoulder rig under a vest, you'd be miles ahead to go with a Glock 36 in .45 ACP (7 shots) or a 26 in 9mm (11 shots).
In your strong side pocket, carry a Ruger LCP in a pocket holster. You'll be Mr. Badass, if the need arises.
Around here, we don't say "Oh shucks", or "oh man". We say Oh BAMA!!