Slug Fever

I'm in the PNW too, and this one is the type I have. 
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It has given me a fail to read. Only in poor light. I just move it. No more problem. 

There's a 1/4" thick piece of clear "pellet proof" glass for protection for long range reading. 

It's bulky. But, I prefer a barn door sized opening to shoot through....

That's a very good idea!