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Old January 24, 2013, 06:17 PM   #17
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Join Date: March 31, 2011
Posts: 120
Also note that the rear of an M16 receiver has an obvious sear cut milled in. AR15 receivers do not have this cut. Installing an M16 autosear into an AR15 receiver requires significant machining. That's why Lightning links and DIASs were invented in the 70s.
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