It saddens me to create yet another topic here discussing a negative issue about Rainer.
I've always been vocal on this website about how much I love this company, and still do. However I'm having some issues that are quite annoying.
I placed a semi large order on Aug 22nd which included a upper receiver and ultra match barrel, among other things, and when it arrived it had the wrong upper receiver in it. I contacted Rainier and the woman on the other end was helpful and polite, she said she would get me the correct upper out that day and email me a return shipping label to return the incorrect upper. The correct upper arrived yesterday (Sept 05). I'm really pleased with how Rainer handled their mistake on the wrong upper. The barrel I ordered has been sitting in bubble wrap in the box, in my air conditioned house while I've been waiting for the correct upper to arrive. I removed the barrel today to build my complete upper now that I have the correct receiver and it appears this barrel has surface rust. I used a cloth and some Slip 2000 to try and remove this, hoping that it was just a stain of something else. It took a good bit off but there is still deeper rust that won't come out. I'm not very happy about the idea of trying to research what the best solvent to remove rust from a brand new, nearly $400 barrel that I've had less than 2 weeks.
Below are the pictures of the barrel AFTER I wiped it down with oil. It's not a large amount of rust but before wiped down was quite a larger patch of it. It's also much more noticeable in life, excuse the poor quality pictures. Most of the rust is around the gas block seat but there is also small traces around the feed ramp area... I didn't bother with pictures of this area because it's not really visible in any pics I could get.
EDIT: I have decided to keep the barrel after purchasing materials and using methods suggested by Rainier. Not all the rust was removed but most was.
Rainier also offered to swap out my barrel to take care of the situation. Thank you for the great customer service.
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