Pick Parts. Build Your AR‑15.
Compare Prices.
firearmmods.com provides AI-powered part selection, compatibility guidance, and live pricing for do-it-yourself firearm builders — starting with AR-15.
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Why firearmmods.com?
Everything you need to build right, the first time.
Compatibility Checking
Automatic checks ensure every part you pick works with your build.
Live Price Comparison
See prices from all major retailers side-by-side, updated daily.
Guided Builder
Step-by-step slot selection with platform-aware part filtering.
Shareable Builds
Every build gets a unique URL — share with friends or save for later.
Ready to start building?
Create a free, shareable build — no account required.
Open the AR-15 Builder