Where could one find a Colt stripped upper?

[jason.mayberry68]

This stripped lower needs a companion. Looking for leads and your ideas....https://uploads.tapatalk-cdn.com/20171209/e2abc4781edf0fb5dcf9627455a00f1e.jpg

[Iraqgunz]

One could start by posting in the correct area. https://www.m4carbine.net/showthread.php?100661-The-Official-Where-Can-I-Get-It-Thread&p=2569075#post2569075

Then one could also check Gunbroker- http://www.gunbroker.com/item/725222447

http://www.gunbroker.com/item/725638772