Build Your Dream Gun — Smarter, Faster
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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.
Track Deals Across 100+ Retailers
Never miss a sale on uppers, optics, or BCGs again.
Smart Notifications for Your Build List
Be first to know when parts come in-stock or hit your price point.
Search That Actually Understands Firearms
Type "BCG" and we show bolt carrier groups, not random gear.
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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Legal Notice
gunbuild.ninja does not sell firearms or controlled components. Always follow local and federal laws when building firearms.