Thanks for posting all this great information. I knew very little about the M5 before reading this thread.
I'm not sure if they've sold any of the 7.62x39 rifles, or if it's just a catalog option looking for a buyer. I'm curious though, what would Colt use as magazine to go with that caliber? I'm assuming it would use an AR-style magazine configuration and not "rock and lock" AK mags.
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The 14.5" model will be posted in a reply here due to ARFCOM's photo posting restrictions.
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There's an easy work around for that if you just need to add a couple extras. Open the forum in a second browser window, start a new post, and then upload the additional photos to that post. Copy and paste the photo links to your original post, and then cancel the second post. You can add as many photos links to a post as you want, but the file uploader stops you from adding more than five directly.