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Re-barreling and Installing a Float Tube on a 5.56mm Service Rifle - AR-15, etc. - Page 2
The upper barrel is the new one and the lower is the one being replaced. The new barrel does not have a barrel nut, as the nut is a part of the "floating handguard assembly".
The front sight will not be pinned to the new barrel, but will be held in place with set screws. Some feel that driving tapered pins through the holes in the barrel places some deforming strains into the barrel. The old front sight was modified as follows:
The "ears" that were used to secure the front sling swivel were removed. The four holes formerly occupied by the pins were enlarged and tapped for 6x32 set screws, the existing hole in the bottom was enlarged and tapped for 10x32, and a new hole drilled was where the old sling swivel used to be and this was tapped 10x32. The set screws on the bottom will tighten against the bottom of the barrel while the four screws on the sides will tighten against "flats" on the sides of the barrel.
The barrel was coated with lay-out blue and a centerline was marked, the same was done to the sight. The sight was slid onto the new barrel, the lines lined up, and a transfer punch was used to mark the locations of where the set screws will tighten against the barrel. In this picture the sling swivel "ears" are still intact on the old sight.