I want to replace the mirrors but don't what size I am supposed to

Lasers
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I want to replace the mirrors but don’t what size I am supposed to get any help I this?

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20mm is standard.
There is SI and MO (and some others) to choose from, SI is a bit better, MO is tougher against smoke and cleaning while SI is very delicate.
Keep away from K9 mirrors - far away!

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