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  1. HK HANDGUN TALK
    Hi all, I'm looking to put a Trijicon 407/507k RDS on my VP9SK and wanted some input regarding backup sight heights. According to Jagerwerks, for the 407/507C (I believe it's a little larger), they recommend the following: For lower 1/3rd Co-Witness you would need a VP9 .405" Dawson...
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