My strap wrench set has two ...
one big, one small.
They work well together for breaking the handguard loose from the barrel nut,
especially if you don't have a receiver wrench to hold the upper while working.
When reinstalling, use one drop of BLUE/removable loctite.
Also you can drill and tap a small set screw or two to hold things together in proper alignment.
TWO of my DPMS build R25s had the bipod stud off at an angle and one tube came loose by hand.
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