I bought the barell and Stock at a gun show today (see below). Now i just want to make sure about what else i need to complete this gun So far I have Bolt, Trigger assembly, reciever. Anything im forgeting. Anyone know of any places that make this stuff aftermarket, as Ruger doesnt sell the reciever. Does anyone actually sell the reciever or am I SOL. I have found them on EBAY, so if worse comes to worse, ill go there. Aything else I should know for building this thing? Whats some good companies and some bad? Thanks Also, where is the seriel number on these things?