Not one problem with it mate, i took it in a trade for my Victory of a mate who previously only used it as a back up marker to his geo2.
He only sold his Geo2 a few months ago, so before that it had seen little use.
Not sure on shot count as it has no oled board (redline was only bought a few month ago when geo2 was sold) but this year it has probably only seen 2 rounds of cpps, 7man cpps and some training sessions.
I believe the bolt improves efficiency although the axe is already efficient without it, makes it a little quieter and reduces kick slightly, but im sure anyone who has shot a stock axe will tell you its great anyway.