I want to get a Trijicon RMR on my Glock 19 Gen 3. Is buying a Gen 4 OEM slide the best way to do it?
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Does Glock 19 Gen 4 slide work with Gen 3?
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Short answer = Nope.
Simplified answer...
The Gen 4-5 Glocks utilizes a bigger recoil spring assembly which changes the dimensions of the slide's interior which makes them incompatible with the Gen 1-3 Glocks.
^Some aftermarket vendors are now selling an adapter to make it work. But, it reduces the reliability of the pistol.
Gen 4 slide on Gen 3 frame
Last edited by Quiet; 06-21-2019, 3:56 PM.sigpic
"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." - Dalai Lama (Seattle Times, 05-15-2001). -
There are aftermarket Gen 1-3 slides that are made for microdot sights.
Examples...
Unity Tactical ATOM series for Glock 19 Gen 3

Lone Wolf Dist Alpha Wolf RMR series for Glock 19 Gen 3
Last edited by Quiet; 06-21-2019, 4:01 PM.sigpic
"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." - Dalai Lama (Seattle Times, 05-15-2001).Comment
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