This is a reproduction, unfinished casting, of the front sight base used on the early ArmaLite prototype AR-15's. These were made by a small band of very dedicated individuals in a limited quantity. This part was cast in steel like the originals would have been. It will need to be finish machined but, if you swing over to the Retro forum here on AR15.com, they can point you in the right direction.
I'm asking $200 shipped. I really don't want to let it go but, things happen.
I accept payment via USPS money order. I will ship as soon as payment clears and I will send you a tracking number.
Again, this is a raw, unfinished, cast. Look at the pictures carefully and make sure you understand what you're getting.
First to post "Ill take it." gets it. I'll send you an IM afterward with payment details. Thanks.