Do I need an f-marked fsb?

[WSM]

I'm about to order a Windham dissipator barrel but the fsb isn't F marked and it's going to be installed on a flat top. Will the sight radius compensate for the elevation difference or should I build my own barrel and use the F marked fsb?

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[mopar92]

Should you have an F marked FSB with a flat top? Yes
You can use a non F marked FSB with a taller front sight though.
I think Brownells carries them.

 

[WSM]

Should you have an F marked FSB with a flat top? Yes
You can use a non F marked FSB with a taller front sight though.
I think Brownells carries them.

Does it stick out above the ears?

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[mopar92]

Does it stick out above the ears?

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I believe it does which is why it's more of a band aid solution but I'd ask WW if they can pin in a F marked FSB instead that way its easy peasy for you.

 

[WSM]

I believe it does which is why it's more of a band aid solution but I'd ask WW if they can pin in a F marked FSB instead that way its easy peasy for you.

Thanks, I'll call WW and see what they have to say.

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[WSM]

WW just told me I'm good to go with the A2 fsb and if I am really concerned about elevation they have a talker pin they can install at an extra charge. I'm not 100% confident in what the guy said.

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[alucard0822]

It's only .040" difference to compensate for added thickness of the rail and Colt bolt-on handle sight. most of the time you have plenty of room to turn the front pin out and 0 it, especially if you are doing a 25-300 or 50-200 yard zero. If not, then a taller pin will be fine, it doesn't stick up past the ears.

 

[MostlyHarmless]

Will the sight radius compensate for the elevation difference or should I build my own barrel and use the F marked fsb?

With the 20" rifle length sight radius of a dissipator, the F FSB is not as important as on a 14" carbine length sight radius. I have a 20" barrel on a flat top upper with a non-F FSB, and the rifle zeros at 25yds with no trouble. YMMV, but I would guess that the Windham barrel assembly will zero just fine without a tall front sight post.

Of course if I was doing it, I'd buy the parts individually- and would probably go with the F FSB just because. Go with a set screw FSB instead of a pin on- it allows you to perfectly zero the windage of your rifle using the FSB, with the rear sight centered.
http://www.fulton-armory.com/frontsightbaseforgedpowerwedgewsetscrewswbayolug-2.aspx