AR-15 spare parts

I have a Bushmaster Plain-Jane AR-15A2 HBAR that is used exclusively as a range plinker/target practice weapon. It gets maybe 200 rounds put through it every month or so.

At that usage rate (in theory, at least) it should go a long time before anything breaks, although I realize anything is possible.

What spare parts (if any) would be recommended for this type of weapon with this usage rate?

Take a look at some of the spares kits from Bushmaster.

This thread has a pic of how I have my “spares inventory” set up.

http://http://m4carbine.net/showthread.php?t=37158

I am having a duh moment. I do that for screws . . . duh. Ok now that I am done drooling in a cup and back to reality. I am going to move my stuff around into a similar set up in the near future.