Metal God,
A used rifle will not be under warranty as far as I know, so the best thing your buddy can do is buy a replacement trigger. I've used Timney's and they are very good, and I can't recomment them enough.
"Tricking" a Rem trigger can happen, although it is normally the result of someone futzing with the trigger and not a trigger malfunction. The USMC Scout Sniper school changed the doctrine to keep snipers from stoning the triggers on their own which often resulted in a trigger that could be "tricked." What did the USMC do about all those triggers that had been honed too much? They bought more triggers straight from Remington.
Jimro
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Machine guns are awesome until you have to carry one.
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