000, probably nothing. if you shoot that gun like most people shoot target guns, i doubt you'll ever notice a difference. if you shoot it like a carbine in a class or tactical match, i'd probably just check the tension on the extractor. If i could move it with my fingers, i'd spend a few bucks on a BCM bolt-upgrade kit. if it's got a "5.56" chamber, i'd probably run Ned's reamer through it. If it's got a "223" chamber, i wouldn't. (and really, you'd want the 223 chamber for a bench gun). other than that, just check the carrier key to make sure it's staked on nice.
as to parts that "break", their CH are prone to bending when abused (which is inevitable when folks get excited), but that's unlikely to happen on a bench gun. and the bolts won't last as long as a quality one, but since you're likely firing around 1 shot/minute or so, not heating the gun up with mag-dumps... your bolt will prob last forever.
the only area i can think of where match guns see more stress is the bolt-catch. not saying yours is likely to break, but think about it. i go out and put 300 rnds through my carbine in a day... that's 10 mags, which means the bolt slams into the bolt catch 10 times. i go shoot my rifle in a 3x600 yrd prone mid-range match... that's 60 rounds, loaded one-at-a-time, which means the bolt slams into the bolt catch 60 times. though i have not heard of this happening with AR15s, I know broken bolt-catches were common in some AR10-variants.
edit: also, just look at all the parts that contact and watch for wear. a lot of wear in the first few hundred rounds is a good indication the parts may not have been properly heat-treated.
