What rail is my flat-top upper?

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Sep 13, 2007
ok, I know I've been asking a lot of dumb questions lately, but I've got plenty more left, so here's one about scope rings ;)

Are mil-spec AR15 flat-top uppers picatinny rails or weaver rails? I'm about to buy some scope rings (extra-high 1" rings), and just want to be clear what mounting type this is. A local academy sports has weaver rings, but I've been told I need picatinny rings. what's the difference? thanks for the help, as always!:eek:
Difference between the two

This must be true, I found it on the internet:D

The Picatinny locking slot width is 0.206 in (5.232 mm). The spacing of slot centers is 0.394 in (10.008 mm) and the slot depth is 0.118 in (2.997 mm).[1] The only differences between the Picatinny rail and the similar Weaver rail are the size of these slots and the fact that they are standardized. Weaver rails have a slot width of 0.180 in (4.572 mm), but are not necessarily consistent in the spacing of slot centers.[2] Because of this, accessories can be and are designed to fit on both Weaver rails and Picatinny rails; but most Picatinny devices will not always fit on Weaver rails.
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