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Unless you are mounting this on a Glock chassis system, this is too big to mount on Glock by itself. You should look for pistol red dot sight (aka micro red dot such as ROMEO1). This is more appropriate for carbine or rifle. I hope this helps!
Russ, this is for a pistol or rifle caliber carbine or rifle. I highly recommend the Vortex Razor : https://www.glockstore.com/Vortex-Razor-Red-Dot
https://www.amazon.com/Mako-Universal-Picatinny-Mount-Pistols/dp/B004O6CDV0/ref=mp_s_a_1_3?crid=2SKIDXA75R3AC&dchild=1&keywords=picatinny+mount. Heres a link to one that would work but Id highly recommend a mount that replaces your rear sight and a smaller red dot meant for a pistol, this ones more for rifles or ar15 pistols.