Just FYI I was trying to buy some things on eBay using the live.com search cashback deal. It is no longer working as far as I can tell. I think it was also confirmed not to work by ar15.com. Too bad. I saved almost $200 on my optics using it.
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Our lower receivers are 100% “Mil-Spec” EXCEPT that the actual “Mil-Spec” includes the ability to fire fully automatically. Our upper and lower receivers meet every other dimension and tolerance in the specification except for that one area, where by federal law, they are not allowed to. However, our lower receivers are fully compatible and completely ready for a registered drop in auto sear!