Without identifying the guilty parties, I need some input to settle an argument.

Party #1 states:

When cleaning a firearm's chamber (more specifically the GSG-5), one may use a brass brush to do so, after all, that's what most cleaning kits include. Brass bore brushes. It's not only ok, but a good idea.  Anything else is silly.


Party #2 states:

Use Nylon only. The aluminum chamber etc will react and cause a reaction between the two dissimilar metals, causing the chamber to corrode/disintegrate earlier than it should.

Any takers?

I think it would only be a problem with prolonged contact. After all, the cartridges you feed through it are brass too.

I can't offer any insight into using a brass brush in the aluminum chamber (although, since they are both soft metals I can't imagine it would hurt).

The galvanic reaction on the other hand (corrosion caused by dissimiliar metals in contact with each other) takes time to occur. It is not something that is going to happen during the time it takes you to clean the weapon. You could leave the brass brush in the aluminum chamber while you were gone for a weekend and it would not cause corrosion.

Google "galvanic reaction".

The chamber is not alluminum.

+10000
What the heck is party #2 smokin?

Chamber and barrel are stainless steel.

Brass is used in plumbing to prevent the "galvanic reaction"

I don't think it is stainless steel since the barrel will rust, I could be wrong but I have never had rust on my SS AR-10 barrel.