The only guns I have seen or heard of actually needing them are alloy frame guns or those chambered for 10mm. Keep good springs in your steel guns and they will run fine without em.
The stop should have enough friction/pressure to fit snugly even without the firing pin pressure. It should take just a tiny bit of tug to slide out when the pin is pushed forward.
I know it would be legal for Zoot Shooting, but is it legal for WB Traditional?
https://www.brownells.com/handgun-parts/sights/rear-sights/1911-novak-cut-rear-sight-prod55698.aspx