After a brief pseudo-game agaist 73rd a couple of weeks ago, I thought I'd post my 500pt army list.
I played against his Necrons, and as I'd never played them and he was relatively new against Guard, we decided to make it a 'first contact'-type scenario...and it was great! He's a great opponent, and the patrolling platoon+ of the 2/24th Cadian were bloody confused by the metallic death-bots!
We fought Combat Patrol rules with a 5th Ed scenario to an agreeable draw before my platoon was doubtless withdrawn to be cross-questioned by Imperial intel cells about their experiences.
Below is my recce force. I wanted to use one of my basic platoons and support it with some extra weaponry, as if they'd taken some extra heavy stuff out on patrol just in case. They also took a commissar with them, and he requisitioned a chimera as his command vehicle - again, just in case!
HQ sect: Jr officer w. P/wpn+las pistol and ID; vet medic; vox; 2 x gren
Commissar w. P/wpn+bolt pistol
Transport: Chimera w. multilaser turret and hull heavy bolter; smoke
1 sect: Sgt w. las pistol/ccw; vox; plasma gun
2 sect: Sgt w. las pistol/ccw; vox; meltagun; heavy bolter
3 sect: Sgt w. las pistol/ccw; vox; gren; heavy bolter
4 sect (r) - 5 pax incl. Sgt w. las pistol/ccw; vox; flamer
There you go - they did me proud!