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Old November 10, 2012, 09:42 AM   #2
Microgunner
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Join Date: March 6, 2006
Location: Central Florida
Posts: 3,324
Colt filled the space in the lower receiver where the auto sear would reside with a block of hardened steel to prevent anyone from converting their rifles into a select fire arm.
This may be what their refering to. Possibly?
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