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[ARCHIVED THREAD] - FSB Question

Posted: 4/1/2011 6:53:22 AM EDT

Hey all,

What is the difference between an F-Marked FSB and a standard FSB?

Thanks.

Posted: 4/1/2011 7:28:25 AM EDT

[#1]

F-Marked FSBs are meant to be compatible with rail mounted iron sights. This doesn't mean that non-marked FSBs are incompatible with rail mounted sights, however. They (may) simply require a slightly taller sight post when used in this manner.

Posted: 4/1/2011 7:43:10 AM EDT

[#2]

http://www.ar15.com/forums/topic.html?b=3&f=66&t=344624

Posted: 4/1/2011 8:05:41 AM EDT

[#3]

F marked FSB is taller (.040 inch) than a standard FSB.

The height is needed for the flattop upper receiver. See the above link

Posted: 4/1/2011 8:48:30 AM EDT

[#4]

Thank you very much. I appreciate the help.

[ARCHIVED THREAD] - FSB Question

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[ARCHIVED THREAD] - FSB Question

[ARCHIVED THREAD] - FSB Question