What rail is my flat-top upper?

[mbpautz762]

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!

 

[Hostile Amish]

picatinny rails can accept weaver rail accessories but not the other way around

 

[JDGray]

Difference between the two

This must be true, I found it on the internet

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.