YANKEE HILL MACHINE AR15 .300 BLK Dust Cover Complete Kit (YHM-111-300)

Great idea for the AR-15 owner who uses multiple uppers on the same lower receiver or identically configured rifles in different calibers. Just add a caliber-marked dust cover to your modern sporting rifle and tell them apart at a glance! The Dust Cover Complete Kit includes the rod, retaining clip and spring and fits all standard AR upper receivers.