I was wondering if there was anything I should know when sending a recently purchased gun back to the factory for repair, because I've never had to do it before. I bought a S&W 642 Airweight revolver about a month ago. Upon close inspection, I realized that the front sight post (and actually the entire barrel) is twisted counter-clockwise (if you're pointing the gun out in front of you) about 1/16th of an inch off-center from the axis of the rear sight channel. Which is why my shots have been consistantly grouping to the right of center (in order to line up the front and rear sights perfectly, I've been pointing the gun slightly to the right). Anyway, I contacted S&W and they're sending a pre-paid envelope. That's all the info I got from them. Is this the kind of thing that can be fixed easily? Is there anything else I should ask them to do such as test fire to see if it's now grouping ok? Maybe request some other service while it's there? Will this repair weaken the gun? This basic fix won't cost me anything will it? Thanks for any tips.