I like the Cz 527 line.
The 527 Carbine, LUX, or the FS come with iron sights.
The small action and magizine feed make them easy to load.
I can not think of another rifle that comes with iron sights. Well Sako does make some models but you said cheap
Howa / Vanguard
Savage 110 / edge
Remington.
Ruger M77 R I with the full stock comes with factory sighs bit I don't think that one comes in 223.
I have Four 223 rifles.
An AR, M700 SPS, Cz 527, and a Carbine Kit for the T/C.
the M700 is a big heavy varmint rifle. the action is 308 based and the little 223's are hard to line up right quickly.
the Cz is no bigger than my 22 hornet and with the mag feed is easy to load and unload and quickly.
The M1 American comes with a 3 or 4 round flush fit mag.
I bought 3 extended 5 round mags for mine and they work great and are not as awkard as I thought they would be.
www.cz-usa.comGo to rifles and scroll down.