AR-15 Upper Receivers — Stripped & Complete Uppers
Find AR-15 upper receivers built for accuracy and reliability, from stripped uppers ready for your parts to fully assembled complete uppers with barrel, charging handle, and BCG options. Each listing includes material, barrel length, gas system, and handguard compatibility so you can match uppers to your lower and build goals. Check Legal & Compliance for shipping and state restrictions.
Our AR-15 upper receiver selection covers mil‑spec stripped uppers, complete uppers (with barrel, gas tube, and BCG), and compatible handguard combos for carbine and precision builds. Choose by barrel length, gas system (pistol, carbine, mid, rifle), finish, and thread pitch. Product pages show twist rates, recommended torque specs, and manufacturer compatibility notes to help you pair an upper with your lower receiver and parts kit. We do not publish step-by-step finishing or machining instructions. For questions about legal compliance or FFL transfers, visit our Legal & Compliance hub or consult a qualified gunsmith.
Q1: What is the difference between a stripped upper and a complete upper?
A stripped upper is just the receiver (no barrel, BCG, or charging handle). A complete upper includes all parts needed to mount on a lower: barrel, gas system, BCG, and charging handle.
Q2: How do I choose the right barrel length and gas system?
Choose barrel length based on your intended use (compact vs. long-range). Gas system type should match the barrel length to ensure proper cycling; product pages list the recommended gas system for each barrel length.
Q3: Are AR-15 uppers cross-compatible with different lowers?
Most modern AR-15 uppers are mil‑spec and designed to fit mil‑spec lowers. Check product fitment notes and manufacturer specs for non-standard or billet receivers.
Q4: Do complete uppers require an FFL for purchase or transfer?
Complete uppers are normally parts and often do not require FFL transfers. However, laws vary by jurisdiction — check local regulations and the Legal & Compliance page before purchasing.
Q5: Can I install a new upper on an existing lower myself?
Installing an upper on a compatible mil‑spec lower is typically a straightforward mechanical swap. If you’re unsure, consult a qualified armorer or gunsmith. We do not provide step‑by‑step build or machining instructions.