If you bought a free-float handguard and then discovered it didn't come with an installation tool — or that the barrel nut doesn't work with your current upper — you've encountered one of the most confusing but easily solved problems in AR-15 building. This article covers the mechanical side: what barrel nut types exist, how they differ, what you need to install ea …
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Glock magazines interchange more than most platforms — but only within the right caliber and frame family, and only in one direction. Here's exactly which Glock mags fit which Glocks. The Two Rules That Govern Everything Caliber must match the magazine body. 9mm and .40 S&W magazines are not interchangeable — the feed lips and body width differ. Bigger frame ma …
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Buyers ask this exact question before every aftermarket Glock 19 slide purchase: Gen 3, Gen 4, or Gen 5 — what actually fits? The short answer is that Gen 3 slides fit Gen 1 through Gen 3 frames, Gen 4 slides fit Gen 4 frames, Gen 5 slides fit Gen 5 frames, and cross-generation swaps are possible but require the matching recoil spring assembly and sometimes a striker swap …
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