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Never experienced any noticeable mag tube flex when shooting my M4s, I own 3 and all have CC Titanium mag tubes..but there’s certainly insignificant-residual flex during recoil whether titanium or steel tubes. Not exactly sure how residual mag tube flex could/would be affecting accuracy when shooting..unless during recoil there is significant enough mag tube flex that results in impacting or affecting the barrel.

Brand new 11795, never been shot. I have a new collapsible stock and the regular stock for it. Located in Northern Virginia, willing to ship. $2300 obo. 734-945-9166