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I've just purchased a 7-round, single piece magazine tube from Dave's Metal Works (they call it their 2 Round Replacement Tube). I'm having issues unscrewing the original magazine tube from the receiver and I don't want to botch it up. Has anyone removed their magazine tube and if so, what method did you use? Was there a serious amount of force/torque needed to begin unscrewing the magazine tube? My M4 is stripped down to just having the magazine tube remaining against the receiver (plus the Forearm Retaining Band). It appears the retaining band is held in place by the magazine tube, so I don't believe the retaining band is keeping the magazine tube from turning. Any help would be awesome!!

I have ordered the Meprolight sights for my M4. The problem is I can't find any info or instruction to remove the rear sight. I'm sure it is something simple needing only a screwdriver or the rim of a shell. Any help will be appreciated.