Hey, lauren99. I just got one of these. I called Armalite directly. GA Sales rep is Dave @ extension #115, 1800-336-0184. I got mine just almost two weeks ago. It arrived just a couple days later. VERY fast shipping.
The part number is EU0240MPKIT; $43.50 retail. If you don't get the "kit" it won't have the two screws you need. Also, this does NOT come with a sight post, spring and retainer. So if you don't have those, be sure to order them too.
Not sure where you're located (I'm in Buford), but there just weren't any local dealers who had these and it would have taken longer for the local guys to order one.
Hope this helps.