All HMMWV's Come with Run Flats...THey act as Bead Locks as well as RF's.
THe Magnesium RF was ONLY used on the Early Bias Ply tire...Junk, and could actually catch fire if used for its intended purpose...Imagine Magnesium
catching fire...good luck putting that fire out. Then there was the Rubber RF's, they came in 2 pieces, the Beadlock and the RF itself, and now the only one
that is standard issue, its a 1 piece RF with Built in Beadlock. while alot of folks hate them....to me they are a no brainer to leave in...I have guys I convinced to leave them in and only to come back and thank me due to some sort of offroad carnage that the RF got them out to a same spot after blowing a tire due to sidewalll damage.