The AR-15 M-LOK Handguard is replacing the old picatinny rail system. M-LOK is a universal system, developed by Magpul, of attachments that locks into your Free Float Tube M-LOK Slots. It is very versatile and is a customizable locking system. We sell the best USA made only AR-15 M-LOK Handguards on the market. With a large variety of styles, you will only have to look in one place for all of your AR-15 M-LOK Rails. We also sell the M-LOK Accessories that will attach to your M-LOK forend. All of our handguards are made in USA proudly produced locally in Scottsdale, Arizona.