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ROUTEMICHIGAN
12-23-11, 01:18
My apologies if this has been discussed before-- but the search function didn't yield any answers. I've only known F marked FSBs-- so what is this <B>1 marked FSB-- what does it mean? I saw it stamped on the right side of the FSB. My buddy said it was the same height of the F marked and he thought it just denoted the forging marks of the manufacturer? Thanks.
Iraqgunz
12-23-11, 10:51
It's the manufacturers markings. I have seen them on Model 1 sales and Armalite AR's (IIRC). I think there are some LMT uppers as well.


My apologies if this has been discussed before-- but the search function didn't yield any answers. I've only known F marked FSBs-- so what is this <B>1 marked FSB-- what does it mean? I saw it stamped on the right side of the FSB. My buddy said it was the same height of the F marked and he thought it just denoted the forging marks of the manufacturer? Thanks.
gau5guy
12-23-11, 12:03
The same marking is on my Colt 6450 9mm Carbine 's FSB (with a carry handle and non-LE marking). No 'F'. From what I understand, this FSB has the older and shorter A1 post, not compatible with more modern BUIS without elevation built-in (flat tops). Otherwise, I could not find any differences between the B vs F. I did alot of searching too, so thanks to you OP for your post and to G&R for your pm.
Tweak
12-23-11, 12:24
completely different mark
http://i13.photobucket.com/albums/a264/artweaker/Troubleshooting/F-fsb-colt-hilite.jpg
samuse
12-23-11, 12:51
I have one with the <B> on one side and F on the other.

Came on a LE6920.
ROUTEMICHIGAN
12-23-11, 13:08
Thanks gents for the replies. Below is a pic of the marking. My understanding now is that it is the same height as an 'F' marked FSB and it's a manufacturer's mark (the company that actually forged it?). Apparently, some FSBs that are 'F' are not marked with an F? I put it up to my 'F' marked post and they look identical.

10573
Tweak
12-24-11, 16:58
http://i13.photobucket.com/albums/a264/artweaker/Troubleshooting/Fsb2c.jpg
http://i13.photobucket.com/albums/a264/artweaker/Troubleshooting/Ffrontsightbase01.jpg
http://i13.photobucket.com/albums/a264/artweaker/Troubleshooting/Fsb1.jpg
Don Robison
12-24-11, 18:33
I think there are some LMT uppers as well.


Yep, I just finished an LMT upper today with that marking on it. It had been sitting in the safe since 2008 so I'm not sure if they are currently using them.
Artiz
12-24-11, 18:39
Yep, I just finished an LMT upper today with that marking on it. It had been sitting in the safe since 2008 so I'm not sure if they are currently using them.

I have an LMT upper that cleared QC Feb 25th 2010 and the FSB has this marking.
markm
12-27-11, 08:38
It just means that it's certified for tactical use. :rolleyes:
scottryan
12-27-11, 15:25
Thanks gents for the replies. Below is a pic of the marking. My understanding now is that it is the same height as an 'F' marked FSB and it's a manufacturer's mark (the company that actually forged it?). Apparently, some FSBs that are 'F' are not marked with an F? I put it up to my 'F' marked post and they look identical.





You are still confused.

The <B>1 has nothing to do with anything other than the forger who made the FSB forging.

Some F height front sight bases are not F marked. I have seen this mostly with LMTs.

What brand of barrel do you have?
markm
12-27-11, 19:16
The <B>1 has nothing to do with anything other than the forger who made the FSB forging.

I quit trying to make sense with this shit a month or two ago.
ROUTEMICHIGAN
12-28-11, 23:29
You are still confused.

The <B>1 has nothing to do with anything other than the forger who made the FSB forging.

Some F height front sight bases are not F marked. I have seen this mostly with LMTs.

What brand of barrel do you have?

Right-- thought that's what I said in my final post. The barrel is a 14.5" lightweight CHF Centurion Arms. Anyway, this thread is done. Thanks for participating everyone.