One of the most common questions we get is “Can I use a Gen 3 slide on my Gen 4?” The short answer is yes. You can and it will function. The longer answer is you don’t really want to without additional steps. Here’s how it goes. A Gen 3 uses a single spring guide rod and Gen 4 uses a dual spring guide rod. The diameter of the Gen 3 guide rod assembly (captive or non-captive) is smaller than the diameter of the Gen 4 guide rod assembly.

If you use a Gen 3 slide on a Gen 4 frame/lower, you’ll have a gap between the slide and the frame like in the picture below.

While this is still functional, it’s very unsightly and can have problems with debris entering through the hole. There are products on the market that you can purchase to fill this gap. The absolute best option is the purchase the correct slide for your fame. Because that’s not always possible, there are things like these adapters. The one shown below is made by Strike Industries.


If you are wondering, “What if I want to use my Gen 4 on a Gen 3?” No. Not without permanently altering your frame.
And for those who are thinking of every combination… yes you can use a Gen 3 guide rod in a Gen 4. BUT, you have to use an adapter (no not the one above). We don’t recommend doing that.
Ultimately, you should use the Gen of slide and Guide rod that matches your frame/lower.
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