Screws into the front of any Yankee Hill free-float handguard to provide added protection for the end of the forearm. Hides view of the barrel from the front of the handguard for a clean, finished look, and keeps large debris out. Cooling ports allow rapid escape of barrel heat and promote airflow under the handguard. Install using supplied threadlocker. SPECS: Aluminum, mil-spec hardcoat anodized, matte black. 15/16' (2.5cm) I.D.