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are you sure the uppers are screwed in ??? everyone ive talked to said they press in.

the look like they have "ridges" not angled threads...



There not a true 'thread' say like a bolt but yes they are supposed to be threaded in until they bottom out. FWIW when I changed the uppers/lowers on my B-van I managed to unthread the uppers and after fighting with the replacements I said F-it and just pressed the new threaded ones into the arm and called it done. Right or wrong I dont know, havnt fallen out yet.