If you look very closely you can make out the groove inside the feed nipple where an o-ring would be. Those o-rings were to help keep feed tubes / ammo boxes snug. A good theory that wasn't the most effective in use. The o-rings were lost quickly, in my experience.
An interesting thing to note on this particular Bushmaster is the full length site rail. This is the only non-Deluxe I have see with such a site rail.
don_howard at msn dot com
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