Originally Posted By: DustHe bought a free float on ebay, and the install ring won't line up with the gas mount in the upper.
Again, I'm guessing. I think you mean the barrel nut and gas block/gas tube.
Minimum torque specs are 35 ft/lbs minimum for the barrel nut, and around 70 ft/lbs max. If it's not a steel barrel nut, try to stay around the 35-50 ft/lbs range. An aluminum barrel nut may fail at the higher torque ranges. You will most likely need a receiver block and a bench vise, a good armorers tool, maybe a sturdy strap wrench, and a good bit of elbow grease. Tighten to fit, not loosen. You may have to tighten and loosen multiple times to get it to fit correctly.
Pics help.