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Posted: 1/10/2003 5:45:15 AM EST
I have a Martin Marietta upper that is having a FTE problem.

If I load a round, fire it, and continue shooting, I have NO problems. Everything works as intended.

However, if I leave a round in the chamber for hours (ie. when hunting) the chambered round will only partially extract when fired. 1/4" of the round will begin to leave the chamber, then the extractor rips off the edge of the case.

When extracted, there is a dirty green/pale blue corrosion on the brass case.

Why?

I know the chamber needs to be cleaned. I want to know what is causing the case to corrode, in a matter of hours, so that it will not extract once fired.

TRG
Link Posted: 1/10/2003 5:54:33 AM EST
Do you have ammonia residue in the chamber? If left in contact with ammonia, brass and copper will turn pale green. This might explain the FTE. It might need a good cleaning.
Link Posted: 1/10/2003 6:41:59 AM EST
[img]http://photos.ar15.com/WS_Content/ImageGallery/IG_LoadImage.asp?iImageUnq=3890[/img] I bet you have a lot of questions. But you were the type of kid that had to try things first.
Link Posted: 1/10/2003 3:29:08 PM EST
Well... The upper is a recent acquisition. I am not sure what was used in its past to clean the bore/chamber. I used a gunpowder solvent today, a copper brush, and some Gunscrubber to clean the chamber and bore. After thoroughly cleaning the chamber, I chambered a brass SA suprlus round. There was no brass corrosion after almost 8 hours in the chamber... Maybe there was some copper solvent left in the chamber from its previous life? Not sure. Thanks guys. TRG ps. ilikelegs, [img]www.tvcc.edu/faculty/ballen/images/photos/playmate2.jpg[/img]
Link Posted: 1/10/2003 3:33:14 PM EST
I'm glad things are back to "normal". LMFAO MM419
Link Posted: 1/10/2003 8:03:58 PM EST
Yes, leaving an ammonia-based bore cleaner around that area COULD oxidize the brass to the point that it becomes sticky. It would not take that long.
Link Posted: 1/11/2003 4:47:35 AM EST
Originally Posted By DevilsAdvocate: Yes, leaving an ammonia-based bore cleaner around that area COULD oxidize the brass to the point that it becomes sticky. It would not take that long.
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Well, let's hope this cures the problem. Check your IM devilsadvocate
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