Meaning of 'RTR', China vs rest of the world

[Northern Farmer]

Taken right off the RC4WD site "While some components may come assembled, it may be in your best interests to check the products to ensure all hardware is tight. In some cases you may want to apply threadlock to some of the hardware that is already installed." In order words like Benny said your best off going through/ testing the entire rc to make sure things are working properly as they should.