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Vortex 2.5-10x32 on a custon SPS tactical 223 18"

I don't see why it wouldn't work. It's a great scope for a short light rifle.

I guess if you were going to do a lot of really early or late hunting/calling, maybe a bigger objective would offer better viewing. I'm just thinking out loud, my experience hunting in low light is non existent due to hunting regs in my area.
 
Not exactly the same but I was running a 2.5-10X44 PST on my 20" 223. I found it was about perfect except for the lack of parallax adjustment. From all accounts the new 2.5-10x32 is better than the x44 so I imagine it would be just fine on an 18" rifle. As a side note I put the PST on my 16" AR for busting yotes and jacks in the desert and it is working out very well.