AIM Sports has a free float handguard for your AR. At 12.5" it will cover all gas systems and give you lots of room for additions to your AR. Compatible with most direct impingement systems and is a solid one piece design with a monolithic rail look, includes barrel nut to mount the handguard.

Specifications and Features:
Aim Sports AR-15 12.5" Free Float Quad Rail Handguard QRFR12
T-marked rails Accepts all standard Weaver / Picatinny 1913 accessories
Compatible with most direct impingement gas systems
One piece design
Monolithic rail look
Mounts over low profile gas blocks
Barrel nut for mounting
Aircraft grade aluminum
Black anodized