The Ultimate Online
Gun BuilderOver 1 million parts configured since 2020
Build your AR-15, AR-10, AR-9 or Glock part by part from over 120,000 parts by 1,500+ brands. Compatibility is checked in real time, prices are live from 35+ retailers, and the exact build shares with one link. Real builds power our parts guides and gun tools, and every brand and ammo caliber we track is priced daily.
Photo: Sgt. Patrik Orcutt, U.S. National Guard (public domain)
Popular Today
The parts builders looked at most in the last 24 hours.
Ammo Prices Today
Cheapest in stock cost per round across every merchant we track.
Gun Laws Near You
What you can build and carry, state by state. Reviewed October 10, 2026.
Texas
Other states people check
Not legal advice. Check your state statute before you buy.
Clone Builds
Full parts lists for the rifles special operations units actually carry.
M4A1 URGI Clone Build Guide: The Modern SOCOM Standard
40 min read
Mk18 Mod 0 Clone Build Guide: The Original CQB Weapon System
36 min read
CQBR Block II Clone Build Guide: The Daniel Defense Upgrade
39 min read
M4A1 Block II Clone Build Guide: The RIS II Upgrade
37 min read
CQBR Block I Clone Build Guide: Every Part You Need
38 min read
M4A1 Block I Clone Build Guide: The Standard-Issue SOCOM Carbine
39 min read
Community Builds
Real builds from GunPartPicker users, a new set every day.
Popular Brands
The brands builders add to their builds most.
What is GunPartPicker?
GunPartPicker is an online gun builder and parts comparison site. Create a virtual build, organize your components, and compare real time prices from trusted retailers in one place.
Whether you are planning a full AR-15 build or researching one part, it replaces spreadsheets, paper lists and guesswork with a clean build you can share.
Filterable Categories
Part lists are broken out by category so no required component gets missed.
Updated Pricing
Prices refresh continuously from the most popular online retailers.
Easy Sharing
Send the exact build by text, email or social media with one link.
Looking for Gunstruction?
Gunstruction, the 3D AR-15 builder on AR15.COM, still runs in a desktop browser at ar15.com/gunstruction. Its iOS and Android apps are gone.
Gunstruction shows you what a rifle looks like. GunPartPicker is the Gunstruction alternative for what it costs: today's price and stock at each store, a compatibility check on every part you add, and one link to share the build. Use them together, or start your build here on any phone or computer.