"Something clamped on the bolt carrier"?
Sounds like someone tried to make an automatic weapon and, when it didn't work, unloaded the gun. This could present legal problems as well as functioning problems. If you can, unclamp the something and see if that solves functioning problem. Then throw the "something" in a deep lake. If you can't do that, buy a new semi-auto carrier and deposit old one in lake.
You should take a good look at that gun make sure the previous owner didn't put in some M16 parts or other illegal stuff.
I agree with Destructo6 that a look at the
www.ar15.com web site will help. They have pictures of the parts involved.
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