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Re-barreling and Installing a Float Tube on a 5.56mm Service Rifle - AR-15, etc. - Page 3
The barrel was mounted in a mill and four "flats" were cut using a 3/16-inch end mill.
Above are the "flats", two on each side.
The floating assembly is slid over the barrel, the upper is held in the holder/clamp in the vise, and the barrel nut, now a part of the floating assembly, is tightened using a homemade hook wrench.Brownells wanted $40 or so for a wrench.
The sight was installed and the lower screws snugged up. The rifle was test fired and sighed using the four #8 set screws to adjust windage. Once windage was correct, all set screws were tightened. Above you can see where the old swivel "ears" have been removed (the shiny place on either side of the right-hand screw) and the new "ears" on the floating tube. Although it looks like one piece, the front sight/barrel is not touching the end of the float tube. The barrel is free floating inside of the tube. The strain from the sling is transferred to the tube, and not the barrel.
Continued on Page 4 J