Swift Instuments Inc make very good scopes for the money.
I have one of their 6x18x44AOs mounted on my 220 Swift and it has served me very well over the last 4 yrs. Good clarity, precise adjustments, terrific value.
I'd say he won't go wrong by puttin one on his 223. Now a 300 Maggie well now that's a different beast.
Do a search as there are other threads on Swift scopes.