A1 REAR SIGHT APERTURE
$7.80
installed easy and works great
I found a stripped C7 upper at a gun show, but no one had the hardware for the rear sight. I ended up not using the A1 aperture, I opted to use an A2 aperture for the larger size peep. This is a high quality set of parts for attaching my aperture sight to the upper.
Installation was easy (instructions or videos can be found online) and the sight works great. The sight went on an M16A1 stripped upper.