For a good LPVO, look at the Primary Arms SLX 1-10. It has the lighted middle Chevron and horseshoe. It is daytime bright for sure and is a true 1x. Eye relief is is a bit fidgety at 10x.
Love mine.
Doc
They do not NEED them to operate. Some companies put two in for more reliability issues. I've never used one that had dual ejector and it operated just fine.
Doc