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AR-15 Upper and Lower compatibility
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January 10, 2013, 11:02 AM
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slugcatcher
Junior Member
Join Date: April 27, 2010
Location: Texas
Posts: 14
Most of them are. Your combo shouldn't be a problem. The Colt Spoters from the 90's used a non-standard take down pin but you can buy adapaters to use those with standard uppers or lowers.
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