Don Hume makes a holster for the 4516-1 with an optic.
H-721 with thumb break.

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2 Cor 5:17
John3:16

I have the h721 open top and was able to alter it to work with the optic and it works very well.
The reason I'm going with the thumb break it's because in this crazy world we live in now I think the thumb break will be a little safer and less accessible to somebody who wants to reach and grab.
The H-721 open top is an excellent holster with great retention.
Don Hume has to make the new one and it will take another two weeks before they're done total of six weeks to make it.

__________________
2 Cor 5:17
John3:16

Do either of you use that holster for concealment, or are you in an open carry environment?