I'll add to my previous comment, in that the newer Lyman 66A and MA, fall in the same category as the FP-71, when it comes to sturdiness. Some claim they "waive like a flag" in comparison to their steel counterparts. The 'advantage' to the Lyman model is that the peep has a quick disconnect feature, and be removed and stored out of harms way when not in use, or in transit.

I never thought I'd grow up to be a grumpy old man, but I did, and I'm killin' it.