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: P-Trim
Piston/Bull Barrel Trim Ring
For T-Series Single Piece AR-15 Free Float
1.080" internal diameter
Includes 4 screws and allen wrench