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Old February 7, 2013, 07:10 PM   #3
Senior Member
Join Date: May 11, 2005
Location: Texas
Posts: 758
Thanks for the info!

Your uppers need to have a "sear relief cut" to work with the M16 auto sear.
Will that affect the reliability of the bolts with my AR-15 lower? I've never had a jam with them, so I'm a bit nervous to tinker with something that works. But then of course, ripping through a 60-round mag of 5.56 with a 7.5 inch upper makes it worth the risk.

Would that also run me afoul of the constant back-and-forth argument about having "M16 parts" (a modified bolt) in an AR-15 when I'm shooting my SBR? Or would that only possibly (not trying to start a new front in the argument) apply to having actual M16 parts in it?
"Our contract called for 16 cases of rifles and ammunition for $10,000 dollars, not a machine gun...........That is our present to the General"-Pike Bishop

When fascism comes to America, it will be wrapped in the flag and carrying a cross.”
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