I free-floated the barrel/handguards on my AR last night.
Grounds for a awarding a black belt in WECSOG-Fu:
-Improvised an upper receiver vice.
-While I used a DPMS armorer's tool to remove the original barrel nut, I ended up having to use a strap wrench to install the Hogue barrel nut for my 2-piece freefloated handguard.
-I bought the Hogue freefloat handguard before realizing it had nowhere on it to install a sling swivel. So, I took a piece of 5/16" all-thread, drilled a 9/64" hole horizontally through it large enough for an Uncle Mike's sling swivel, drilled a 5/16" hole through the bottom of the handguard and sandwiched it in place with some washers and nuts.
The results:
Before:
After:
Close-up of sling swivel: