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11/24/2017 4:44:23 PM
11/22/2017 10:05:29 PM
Posted: 9/9/2004 9:18:27 PM EST
From my understanding Colt makes a taller FSB specifically for the M4 type barrel. Logical reasoning would lead me to conclude that the reason they did this is because the sight radius is shorter thus the base would need to be different compared to say the same FSB that would be on a 20" bbl. If this is the reasoning for the taller FSB why is it that Colt is the only manufacturer that I have seen with this? Is the FSB taller on an M4gery upper made by Bushy?...RRA?? Any other manufacturers.

Also, had anyone had any problems with accuracy and sighting in with the regular FSB?

Thanks in advance.
Link Posted: 9/10/2004 5:18:49 AM EST
Link Posted: 9/10/2004 5:21:34 AM EST
I thought it had to do with all the flip up rear sights on flat-tops needing you to unscrew the hell out of a normal front sight to zero them.
Link Posted: 9/10/2004 5:26:28 AM EST
Flattops either require a slightly taller FSB or a slightly taller front sight post in order to achieve a correct mechanical zero. My LMT M4 barrel has the "F" stamped FSB.
Link Posted: 9/10/2004 5:51:22 AM EST
[Last Edit: 9/10/2004 6:02:20 AM EST by BravoCompanyUSA]
Link Posted: 9/10/2004 12:15:36 PM EST
I believe that bushmaster makes there carry handle shorter to compensate for the carbine
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