Whiteish brown stuff under FSB > AR Discussions

Posted: 8/1/2004 5:02:23 AM EDT

The last couple times I have shot my AR I have noticed that there is a whiteish brown substance around the edges of my FSB almost like it it coming from underneath it. Anyone know what it is or have any suggestions of how to get rid of it? I have not tried anything yet.
Thanks

Posted: 8/1/2004 5:30:57 AM EDT

[#1]

Rust?

Posted: 8/1/2004 6:36:32 AM EDT

[#2]

Probably rust. If you have any other barrel besides a Colt or LMT, they park the barrel after the FSB has been installed. Therefore, the area beneath the FSB is bare metal. Wipe it down and just make sure that you apply some CLP there periodically.

Posted: 8/1/2004 8:04:02 AM EDT

[#3]

Quoted:
Rust?

That would be my guess....

Try a toothbrush and some CLP.

Posted: 8/1/2004 9:23:31 AM EDT

[#4]

Just a quick correction...Colt and FN are the only ones to park under the FSB. LMT does not do it.

Posted: 8/1/2004 9:24:42 AM EDT

[#5]

... Cocaine, it's a helluva drug

Posted: 8/1/2004 9:34:03 AM EDT

[#6]

Rust mixed with gas residue?

Posted: 8/1/2004 9:37:31 AM EDT

[#7]

Quoted:
Rust mixed with gas residue?

rusidue

Posted: 8/1/2004 9:48:11 AM EDT

[#8]

Quoted:
Just a quick correction...Colt and FN are the only ones to park under the FSB. LMT does not do it.

I did'nt think any company was stupid enough NOT to park under the FSB

Posted: 8/1/2004 10:26:55 AM EDT

[#9]

Quoted:
Quoted:
Just a quick correction...Colt and FN are the only ones to park under the FSB. LMT does not do it.

I did'nt think any company was stupid enough NOT to park under the FSB

Amazingly, it seems to me, unless the contract calls for it in the specs, the default seems to be, park it after assembly. This is one of those things the Colt guys (rightfully) point to, since Colt rifles stick closely to the military configuration.

Posted: 8/1/2004 10:31:28 AM EDT

[#10]

if it's oozing out, I have seen grease used in the assembly of barrels..

Posted: 8/1/2004 10:31:56 AM EDT

[#11]

a couple of my old beaters have the same stuff, it is no big deal

Posted: 8/1/2004 10:42:40 AM EDT

[#12]

Quoted:
Just a quick correction...Colt and FN are the only ones to park under the FSB. LMT does not do it.

Bradd, you maybe right on this, however I was told LTM does park before putting on the FSB. Can anyone corroborate? Thanks.

Posted: 8/1/2004 10:53:31 AM EDT

[#13]

Quoted:
Quoted:
Just a quick correction...Colt and FN are the only ones to park under the FSB. LMT does not do it.

Bradd, you maybe right on this, however I was told LTM does park before putting on the FSB. Can anyone corroborate? Thanks.

Neither of my LMT's are parked under the FSB. Here is a thread where I asked this question before buying my uppers.

LMT barrels

Posted: 8/1/2004 10:54:53 AM EDT

[#14]

Quoted:
Quoted:
Quoted:
Just a quick correction...Colt and FN are the only ones to park under the FSB. LMT does not do it.

Bradd, you maybe right on this, however I was told LTM does park before putting on the FSB. Can anyone corroborate? Thanks.

Neither of my LMT's are parked under the FSB. Here is a thread where I asked this question before buying my uppers.

LMT barrels

Well the product infront of your face is the best evidence I suppose

Posted: 8/1/2004 10:58:58 AM EDT

[#15]

Quoted:
Quoted:
Quoted:
Quoted:
Just a quick correction...Colt and FN are the only ones to park under the FSB. LMT does not do it.

Bradd, you maybe right on this, however I was told LTM does park before putting on the FSB. Can anyone corroborate? Thanks.

Neither of my LMT's are parked under the FSB. Here is a thread where I asked this question before buying my uppers.

LMT barrels

Well the product infront of your face is the best evidence I suppose

The only reason I know is that one of them has a KAC FF RAS on it which requires removal of the handguard cap. This leaves a little gap behind the FSB where you can see bare metal. Other than that you really can't tell.

Posted: 8/1/2004 12:34:41 PM EDT

[#16]

I've taken the FSB of a Shaw barrel that I got from JT and a Wilson barrel I've got from RRA, both were parkerized under the FSB. Go figure ?

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