The original Picatinny rail systems were designed and used by the military. With the introduction to the AR-15 to the civilian population, it has made its way to the average rifle owner. Rifles with flattop receivers use Picatinny rails for the most part.
Not only are Picatinny rails available on rifles, but this same sight mounting system can also be found on pistols, shotguns, and crossbows. Most modern, semi-automatic pistols have a rail on the front section for the installation of accessories like laser sights, flashlights, and other pistol add-ons.
Conclusion: Weaver Rails vs. Picatinny Rails
While both rail systems are widely used and quite popular, you are more likely to find a Picatinny rail system on modern firearms.
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