Top 2 grip screws can damage the solenoid if you wind 'em right in,more so on custom grips like Hybrid etc.
And the detents can split sometimes but look ok,had it happen to me once.
Otherwise they run and run
im sure have already got a copy of the manual.... everything you need to know is in there. they really are that simple to look after.
as already mentioned dont over tighten the grip screws as they can hit the noid underneath. this is mainly an issue with aftermarket grips being thinner than the standard ones.
keep a spare set of detents in your kit just in case but other than that you should be golden. to avoid over stressing the detents make sure that when your marker is not in use that the bolt is pulled back.
lube the rammer and bolt after a days use and the regs after a month or so....
theres not much else too it really