^^^^^^^^^
What he says. It's a new gun. If you are lucky, a gunsmith would simply hand it back to you and tell you to enjoy. Or he could take it into the back room, move the charging handle back and forth a couple of times, and come back out and say that it will be $40 please.

As far as rifles go, combat style arms are built so your average soldier can do basic maintenance in the field. They are really simple machines. Although a lot of shooters like to pull the trigger and hammer out on a regular basis for cleaning, I really can't recommend it unless replacement is needed. The pins and the holes that they are in are built to tight tolerances. Remove them too often and you will destroy those tolerances and the pins will be loose in their holes.