Choose Black or Grey to better match the color of your Upper. Understand this is not verified, just our guess as of now. If is our belief that the smaller sized font on the Wheels are earlier Generation Wheels, possible Gen 2. This is the set of rear sight parts you need for a multitude of upper receivers, as well as some stand alone rear sight units - including Canadian C7/C8 builds using the C7 (M16A1E1)upper receiver and Daniel Defense A1 Rear Sight Units. These are used Colt parts that came off old rifles in Good condition. Original Colt complete Rear Sight Assembly for all Colt AR-15 / M16 / M16A1 models before the introduction of the M16A2 sight in 1983.
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