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Posted: 5/20/2002 3:41:57 AM EDT
I have a couple of SP-1 uppers. One is marked CK. Who is the manufacturer of this Colt upper? Thanks.
Link Posted: 5/20/2002 4:16:47 AM EDT

Kaiser (sp?)
Link Posted: 5/20/2002 5:41:41 AM EDT
Thanks. On Biggerhammer they have some other markings, but not this one. I appreciate your help.  Joe
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