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Posted: 9/12/2009 5:50:59 PM EST
I've got a Del-Ton A2 mid length and I get a fair amount of carbon fouling under the handguards and near the front sight post. How much is too much? I'm not worried about cleanliness but am curious if there is a leak at the FSB.

Thanks.
Link Posted: 9/13/2009 3:18:53 AM EST
Does the rifle run properly?
Link Posted: 9/13/2009 4:25:38 AM EST
Yes your FSB/gas block is leaking. I would seriously look at fixing the problem before it becomes a bigger problem down the road. Delton should repair/replace the FSB for you under warranty.
Link Posted: 9/13/2009 11:16:50 AM EST
Never fired an M16/AR15 that didn't do this.

Link Posted: 9/14/2009 5:04:25 PM EST
We need pics.
Link Posted: 9/17/2009 9:40:58 AM EST
The leak will probably fill with carbon and stop leaking soon.
Link Posted: 9/17/2009 10:11:56 AM EST
I had issued rifles and my own do the same. Worked fine. This is not an engine oil leak.
Link Posted: 9/17/2009 5:41:06 PM EST
If it functions fine, I wouldn't bother with it. Mine has a little bit of residue under the hand guard. That's how I remember which hand guard is the upper versus the lower.
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