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I know this is an old post, but I recently acquired a Mossberg 500A with the sidewinder conversion on it as part of a collection I purchased. The gun has been kept spotless and well oiled. It looks like it has never been fired, but I cannot vouch for that. The only damage to the gun is someone knocked the bead off the front site. There are 2 drum mags with this unit.
I'm not interested in pump guns, so I'll sell this to anyone who makes a reasonable offer for it. Sorry about the lighting in the photo.
I am replying to this post if it