Back many years ago, I wanted a rimfire pistol to shoot (I was working my first job after college and I was counting every centerfire cartridge I bought) - so I decided I "had to have" a Ruger MKII with a 10" barrel.
Bought it through a special order from Potomac Arms in Alexandria, VA.
Well - it eventually came, and it was a lemon. Wouldn't ever fire more than a string of 2-3 rounds before a failure to fire. Tried all kinds of ammo, except, of course, the expensive stuff, which defeated why I'd bought the gun in the first place.
At the time, I didn't understand that the manufacturer would make things right -- I didn't realize that I could have just shipped the damn thing to Ruger - and so I traded the gun in (at a loss) towards a CZ-83, which I still have.
And, in hindsight, the probability is that the firing pin was a hair or two short - and would have been trivial and cheap to replace.
You live, you learn.
--Neill
(What's really funny is that a couple of years later I bought the stainless variant of the same gun - the KMK10 - and eventually sold it because it was so accurate it was boring to shoot inside of 25 yards).