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In a short barrel,
a bigger ( diameter ) bullet it better
because it allows more velocity for any given bullet weight.

As Art said, in you will have pretty low velocity in a 223, as well as a lot of flash/blast in a 10.5" bbl.
It is probably one of the poorest choices in a short barrel.

IF you want to stay in the relatively powerful intermediate rifle cartridges and keep/reuse your mags,
a 6.8 or 7.62x39 would probably both be better choices, depending no your intended purposes.
The only other issue with such short barrels is that the DI system is at/beyond its limits and a piston system is better.

If you want to have a much less potent ( and less expensive ) cartridge,
a 9mm, 40 or 45 are good choices and a 10.5" bbl is considered long for a pistol, so velocity will be high and blast low.
These all use pure recoil operation so there is no short gas system to worry about
but you will need a magazine adapter and new mags.

Come to think of it, the AR57 upper seemed like a pretty slick solution with top mounted 50 rd magazine and integrated recoil spring. Perhaps someone should make that in 40s&w, because I can't come up with a good use for the FN 5.7x28

Your best route depends on what you want out of it.
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