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.
Piston compatible, works with most well known piston systems including, Stag, CMMG, Adams Arms, ARES, S&W, and LWRC to name a few
Specifications and Features:
Constructed with a 6061 aluminum and hard coat anodized for a lifetime service
No gunsmith installation, installs like the factory plastic handguards.
MIL-STD 1913 rails, T-Marked for accessory location