![]() In order for the proper front sight base to get put on the correct rifles, Colt was marking front sight bases for flat top rifles with an ‘F’. The specifications for a front sight base for a flat top rifle is different from a front sight base that is put on a rifle with a fixed carry handle. Today, I am going to briefly touch on the most visible change of recent and that has been the elimination of the ‘F’ on the front sight base as seen in the photo below.Īt one time Colt was producing flat top (picatinny rail on the top of the upper receiver for a detachable carry handle, optics, etc.) AR’s and AR’s with fixed carry handles at the same time. The vague history of the different marks (forge marks on upper receivers, markings on the top of barrels, ‘F’ marks on front sight bases, etc) have had their roots in either DoD contract requirements or some other manufacturing necessity. One of the recent hot-topics in the Colt collecting community has been Colt eliminating some of their production marks on their AR-15 rifle components.
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