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Discussion Starter #1
I have a new 2019 Mark iv Target with the new style adjustable rear sight that has two set screws into the dovetail.
Does anyone know the hex wrench size for these two screws? I can't get a 1/16" hex wrench into the holes.
 

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That hex wrench size is so small, it felt like it was going to strip out when I used it.
Plus I didn't want to have to carry a tiny hex wrench to the range, so I swapped it out for a slotted screw.
 

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I don't know what size you need, but here are the next smaller size wrenches available.

1/16" (SAE) = 0.0625"
1.5mm (metric) = 0.0591"
1.3mm (metric) = 0.0512"
0.050" (SAE) = 0.0500"

Please let us know which one fits best.
 

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Discussion Starter #5
Additional FYI:

"Thank you for contacting Ruger Customer Service.

The hex wrench size that you would need is .05 for the set screws. We hope this helps. Thanks for the e-mail and have a great day.

Ruger Customer Service"
 
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