If you go with an AR, you can purchase a 7.62x39 upper to shoot 30cal rounds. The lower will still accommodate AK style 7.62 banana clips, so you won’t need any other modifications. If you later decide that you want to fire 5.56, you can swap out the 7.62 upper for a 5.56 upper. That is the beauty of the AR platform. Also, it is worth noting that the standard AR round is 5.56, which has a more powerful load than standard .223 ammo. You can still fire standard .223 ammo from an AR, but you should not fire 5.56 from a standard .223 firearm due to the higher pressures generated by the 5.56 rounds.
Alternatively, you can purchase a 300 blackout upper, which is a 30cal round in 5.56casing, meaning that you do not even need different mags. 300blackout rounds are a lot more expensive than standard 7.62 rounds though, because they are something of a specialty product designed for better performance out of suppressed SBRs or pistols. If you aren’t building an SBR or pistol, a 7.62 upper will be more economical.
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