Thanis

I'm far from a purchase, but just to increase my knowledge base, I was wondering.

I was told to purchase a 5.56x45mm chambered firearm, as the 5.56x45mm firearm can use either 5.56x45mm or .223 Remington, however the .223 Remington chambered firearm can not safely fire the 5.56x45mm round. I get the concept, as it is true, but I'm wondering about practically.

On average, does the 5.56x45mm firearm cost more? Is it available for civilian purchase? Is there a disadvantage to shooting a .223 Rem out of a 5.56x45mm chambered firearm (beyond the different ballistics of the rounds)?

I'm only starting serious consideration. I'm not sure about availability (of anything), still, always good to learn. Thinking an AR-15. I might wait till I hear more about FN scar (semi-auto version has a price tag, but just interesting all the barrel options and maybe caliber options). This is the first time I've heard about the 5.56x45mm vs .223 Remington consideration. Could use help past this part of the learning curve.

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S&W 642 (no-lock) with .38 Spl +P 135 GR Gold GDHP
Glock G31 & G33 with .357 Sig 125 GR. SXT Winchester Ranger