More than likely you have the wrong front sight base. The kits come with a standard A2 sight base which is paired with a carry handle upper receiver. The flat tops require a F-marked front sight base which is shorter.
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More than likely you have the wrong front sight base. The kits come with a standard A2 sight base which is paired with a carry handle upper receiver. The flat tops require a F-marked front sight base which is shorter.
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