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Posted: 7/21/2008 8:08:43 PM EDT
What F marked FSB on flat tops means
Link Posted: 7/21/2008 8:10:28 PM EDT
[Last Edit: 7/21/2008 8:12:31 PM EDT by Bushylover]
Whether it's a flat top or not would have nothing to do with it, although you'd want one in that case. The "F marked FSB" is a front sight tower with an "F" stamped into the metal. The "F" means that it's mil-spec. They are taller, for the flat top, designed to match the height of Mil-Spec height rear iron sights.
Link Posted: 7/21/2008 8:10:34 PM EDT
Front? or Forward?
Link Posted: 7/21/2008 8:12:19 PM EDT
[Last Edit: 7/21/2008 8:12:38 PM EDT by new-arguy]
Link Posted: 7/21/2008 8:14:59 PM EDT
It's for use with flat top uppers.

The detachable carrying handle attached to the upper is slightly higher than an A2 upper, and it would make a carbine especially, shoot higher, or have the front sight unscrewed almost completely. A quick fix for this was to make new FSB a little bit taller, thus, F marked FSB.

However, some FSB are marked F but actually aren't any different from a standard FSB.
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