Congratulations on the new lower! I'm assuming it's complete? i.e. nothing more for you to build. Yes, you can buy an upper tomorrow at Midway if you like, but sometimes its better to wait a bit and see what comes up at your LGS used. I've got TWO complete PCF (Plum Crazy Firearms) polymer lowers sitting in my safe with no uppers to mate them to (yet). I figger I'll find a takeoff from some guy's rifle someday. (of course.... I already have a working AR, so I'm a little more relaxed).
Happy Shooting and another 
Michael
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COTEP: CBOB578
DW CCO
SIG GSR 1911
SA Micro Compact
and a spectacular cast of others!
"You have never lived, until you have almost died. And for those who fight for it, life has a flavor that the protected will never know." Guy de Maupassant, 1893.
Anonymously, penned on a sign at a command post at Khe Sanh, RVN.
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