I've got a Fulton Armory "Handguard Float Tube, N.M., CMP/DCM Legal (includes gas tube)" It's the kind that will let you use regular handguards on top of it.
Swapped the barrels on my uppers around and figured it was a good time to install it. But, umm... how? Anyone have instructions? I already figured out that I needed to grind off the sling swivel from the FSB, and did that.
Edited to add:
Got it mostly installed.
The frikin free float tube is larger than the inner diameter of my armorer's wrench, so I can't seem to get the barrel nut to tighten enough.
I see that Fulton Armory sells a "Armorer's Float Tube Wrench, perfect for Fulton Armory's float tubes!" but it looks like it would not work on this one, because how would I get the closed circle over the free float tube? Gah!
The unit came with _no_ instructions, and the FAQ on their webpage is useless, and they aren't open on the weekends. Gah again!
I saw in another thread that DPMS has one of their wrenches on sale. Anyone know if this wrench will work on the Fulton Armory free float tube that I have? It says it can "Install and disassemble Free Float Tubes"
Or do i need this one? "Used to install most free float tubes to upper. Made from steel plate with two wrenching pins."
This is the wrench that I have currently.
You'll have to get the DPMS multipurpose tool - you use the collapsible stock cutout to tighten the lock ring on the barrel screw. If you look at the lock ring, you'll notice a small dimple in the ring. This engages the nipple on the wrench to tighten/loosen. Apply some blue locktite to the float tube and the lock ring so that it all stays put.
Got the DPMS wrench today.
Took a while, but finally figured out how to get everything together properly.
Now I just need to trim down a set of handguards to fit.
Here's a semi-blurry picture:
Thanks for the help!