I've been spending a lot of time with the AR-15 and have found that small parts like this locking ring, which is important to keep the dust cover post in place, are also easy to lose if it falls down. Most stores sell them for under $2 each, so I now have a good number on hand in case I either throw one away or just can't get them with the parts kits I ordered. They cost me about 10 cents each. If necessary I will buy more.
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