FN USA has had a legendary reputation for constructing some of the most capable rifles in the world. The SCAR is one such rifle and through the years its gone through some quality-of-life improvements. Starting with the addition of the nonreciprocating charging handle. This allows the user to manipulate the rifle without causing jams or a smack on the thumb or hand. Now you can take that enhanced capability and give it to your legacy rifle. So make manipulating that rifle even easier with the Nonreciprocating charging handle kit from FN