Well, most everything from Harbor Freight sucks, but these are especially bad.
I was trying to loosen a PRI hand guard nut (which holds the hand guard on the upper, not the barrel nut) and the strap broke on the smaller of the two pack HF strap wrenches. So I switched to the larger and and that strap broke. I tied the smaller strap-wrench strap in a knot, ran it back through the handle and it broke a second time. I did the same with the larger wrench (as pictured above). And managed to get the job done.
So, lessons learned. . .
Improve adapt and overcome?
Don’t buy crap tools?
Use a more modern hand guard?
Use it as an excuse to write on a website?