Manufacturers AR15 / M16 M4 Carbine Handguard Liner, Carbine, Round, Aluminum Finish (5-13/16" OAL: End Tab Style)
Handguard Liner, Carbine, Round, Aluminum Finish (5-13/16

This part is found in the following schematics

Handguard Liner, Carbine, Round, Aluminum Finish (5-13/16" OAL: End Tab Style)

This part is found in the following schematics