4.5-14x44 Burris FFII with Ballistic Plex fits mine, and makes it pretty handy for lots of stuff. Not the lightest option, but I bought mine for the twist and accuracy of a 223 that would shoot everything well, so that wasn't the main consideration.
If you're going to tote it a bunch and want to keep it light, I'd probably go VXII 3-9x40 and call it good.
DJ
