Bolt stop roll pin

[FrankenMauser]

That is a better explanation than I can provide as "they" don't seem to be listening to what I'm telling them.

I think "they" understand exactly what you said.
It just doesn't really matter for this specific topic. (Not to mention that the types of pins you're trying to differentiate between are just variations of the same idea. They're BOTH types of spring pins.)

Pin goes in hole. Pin stays in hole.
That's all that matters.

I've also never seen an LPK that didn't have a split spring pin.

The point you're trying to make is about as important and clear as a Camaro guy walking into a Mustang car meet and going on for two hours about how the wheel bolt pattern is all wrong on '67 Mustangs, because it never would have been used on a '67 Camaro...

 

[Mobuck]

"I've also never seen an LPK that didn't have a split spring pin."

Well, I HAVE and it makes assembling the lower so much easier. When I buy spares, I get the coiled pins and the price difference is insignificant.