Most likely, the different colors represent different grades. IMHO, the color of the trigger doesn't mean jack as long as every time you pull it the gun goes bang.
Is it better to do the right thing for the wrong reason, or to do the wrong thing for the right reason? If you do the wrong thing for the right reason, is it still the wrong thing?
Si vis pacem para bellum.
To those who wish to take away our Second Amendment rights. What will you do when we, all 100,000,000 of us, stand as one, and say no?