weaver mount vs picatinny mount

[drjoker]

Hi, I have a quad rail ar. Will an integrated weaver mount red dot reflex sight mount on my ar? I wanna buy the sightmark red dot reflex sight on sale for $25 @ cabelas this weekend. Thanks,

[couzin]

There are differences - but a weaver base device will fit on a picatinny rail, a picatinny device won't always fit a weaver rail.

[drjoker]

There are differences - but a weaver base device will fit on a picatinny rail, a picatinny device won't always fit a weaver rail.

Thanks.