It is good to see that Brownells now has these. I almost ordered from an evil-bay dealer in the UK.
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Brownells allowed me to return a sight pusher even though I made it clear to them that it was not in any condition for resale. I would buy from them if they carry the product.
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Mine worked fine when I cleaned it with a t shirt.
When I found out I was wrong and tried to follow instruction I turned it into a bathroom window.
It is best to use compressed air before cleaning the lens.
Shield announced a "waterproof" version coming Q2 2018, at SHOT