Winchester Universal is garbage, but it's not the issue. Mossberg's QC is. The design is great, but there are lots of tooling marks and grease that needs to be removed.
Follow this guide
http://www.migunowners.org/forum/arc.../t-287224.html
This took me about 3 hours and I was still getting ftfs. Of all things, the extractor was too tight, and it was causing shells to chamber at about a 20 degree angle and become stuck when entering the chamber. I removed and degreased all parts of the extractor, weakened the spring with sandpaper, and polished the detent. My gun is awesome now, and runs even the cheapest lowbrass birdshot I can find.
These are great alternatives to Benelli, but they need some work to run.
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