[Found One] WTB: RRA Pistol Receiver Extension

[armygunsmith]

I'm looking for a RRA Pistol Receiver Extension (AR0113P). I would like to find a retailer or seller that is fairly local to me (Redondo Beach). I know I can order from the site, but I figure it's a good excuse to meet another Calgunner. :)
Even if you have another brand of pistol receiver extension, shoot me a PM.
Thanks.

[armygunsmith]

Those of you actually using the RRA pistol receiver extension, what weight of buffer are you using?