Its pretty irritating that they expect you to pay shipping like that. I bought a Mossberg 590 back in November. The thing was an out-of-the-box failure. It couldn't feed ammo at all. So I called Mossberg and they tried the whole "send it back and we'll fix it!" but I fought them hard on that. Eventually they capitulated and emailed me a prepaid Fed Ex label. 8 weeks later they sent it back to me and it still didn't work. I called again, and this time they gave me a prepaid label no problem. 8 weeks later, I got the gun back and it appears to work.
Springfield, on the other hand, is amazing. I *thought* I had a problem with my 1911. I called them up, they IMMEDIATELY emailed me a prepaid label. When I got the gun back, they had refinished it and polished the feed ramp, both at no charge. And, it turns out my original complaint (a wierd "chip" in the disconnector tunnel) was just a normal 1911 wear pattern. Springfield's customer service is par excellence.
One shouldn't have to pay shipping for warranty issues.