If you are looking for a handguard that can easily be installed on your AR, The Midwest Industries Carbine Length Two Piece Drop-In Handguard is your best option. There's no gunsmith installation, and installs like factory plastic handguards.
Features and Specifications:
Manufacturer Number: MI-SS-SA
Designed specifically for SS-series AR-15 free float tube
Includes mounting hardware
Weight: 1.5 oz. with mounting hardware
Constructed of 6061 aluminum
Hard coat anodized