Co-witness a red dot on a pistol?

Mar 2018
5
0
Woodinville, wa
I know there are two options for the co-witness set up. The question i have is if you think it is necessary to have when you have your barrel milled for a red dot? Do we really need it to date based on tech advancements with them? Having one installed, should i dump the money and have them do it or no?
 
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