Firearm & Gun Forum - FireArmsTalk.com > Long Guns > Auto & Semi-Auto Discussion > AR-15 Discussion > 603 (M16A1) and A2 front sights?

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Old 07-07-2013, 04:20 PM   #11
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The "F" marked sight bases are slightly higher than A2 FSB's and were intended for use with rear sights mounted to a picatinny rail upper receiver.

Since early M16's, at least those used prior to the 1980's, didn't have picatinny rails on them, there's no need for a "F" marked FSB.



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