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You should be fine, but I'd carry on if at all possible. If your flight from LAX is delayed and you're late arriving, you may make it your Dublin flight, but your bag may not, if you check it. I am also assuming you're not flying 2 separate airlines that aren't partners (i.e. you'd have to claim your bag in baggage claim, recheck it, go through security again, etc - some people try and do this to get good deals).