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The Smarter Way to Build Guns

gunbuild.ninja helps you plan and build your firearm from the ground up — with tools that save time, money, and guesswork.

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Never miss a sale on uppers, optics, or BCGs again.

Smart Notifications for Your Build List

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Fitment & Spec Data You Can Trust

Instantly know if that handguard will clear your gas block.

Crowdsourced Intel from Real Builders

Verified compatibility notes, install tips, and reviews from people who've run the gear.

Trusted by Builders

Whether it's your first AR15 or your tenth custom build, gunbuild.ninja gives you the tools to do it right the first time.

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