All kidding aside how much is one of those polymer lowers really worth? It seems to me the PSA upper is not in question, it is only the lower. I guess it matters as to which LPK it has in it? Or since that can be transferred to a different lower does that matter? Is the LPK specific to that polymer lower?
In all honest Shaker, I wouldn't really worry about how much it is worth, but that is just me and how I look at my guns. I don't put a monetary value on them because I never sell them so it is immaterial to me. Shoot the hell out of it and enjoy it. Keep an eye on the lower and if it shows any signs of wear or breakage then replace it (maybe with this PSA stripped lower for $70.00 http://palmettostatearmory.com/index.php/featured/palmetto-state-armory-blemished-lower-receiver.html
). Or replace it now and keep the polymer one for a rainy day