They are test fired with one or two rounds... They do not come from the factory properly lubed. They typically have a rust preventative applied, not a lubricating oil.

You guys do whatever you want to do with your rifles... but the smart play is to break down, clean, inspect, lube, and function test before heading to the range.

Think about it... you just bought the least expensive AR in the M&P 15 line up. Do you think they spend the time properly lubricating the rifle for use with a quality lube? Nope, they don't... dip the parts in a rust preventative, box it, and send it out the door!