Short answer: slides and recoil springs are generation-locked, barrels mostly swap between Gen 3 and Gen 4 (Gen 5 is its own platform), and magazines run across all three. The chart below covers every major 9mm part for the Glock 17, Glock 19, and Glock 26 across Gen 3, Gen 4, and Gen 5 — so you know exactly what fits before you order. Get the slide and frame generation right a …
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