Micro AR Pistol Uppers — Compact Power

When you want a firearm that blends mobility, compact size, and real performance, a micro AR pistol upper is one of the smartest choices. At AR15-Overstock, we stock a broad selection of micro and compact uppers so you can build a nimble AR pistol that fits your needs — and we’ve focused the links below so you can shop uppers first.

What is a micro AR pistol upper?

A micro AR pistol upper is a short-barreled upper receiver — typically in the 5" to 7.5" range — built for ultra-compact AR pistol builds. These uppers keep overall weight and length down while maintaining the core reliability of the AR platform when paired with the correct gas system and BCG.

Key benefits

• Compact handling: Fast presentation and easy maneuvering in tight spaces — great for home defense, truck guns, or range drills.

• Lightweight: Less barrel and handguard weight up front for quicker transitions and less fatigue.

• Highly customizable: Works with most AR-15 lowers and supports a wide range of muzzle devices, rails, and sights.

• Performance-focused: Modern micro uppers are engineered to cycle reliably when matched with the right parts.

Popular micro upper setups

• 5" uppers — maximal compactness for tight environments. See our 5" options: Shop 5" Uppers

• 7.5" uppers — a balanced compact choice that improves ballistics while staying maneuverable: Shop 7.5" Uppers

• Micro/compact uppers in multiple calibers — 5.56 NATO, .300 Blackout, and 9mm options are popular choices: Browse All Uppers

If you prefer a full package, many of our uppers are also available as complete pistol uppers or in pistol kits — but the links above focus on uppers first so you can pick the exact barrel, gas system, and handguard you want.

Common uses

• Home defense: Quick handling indoors and easy storage.

• Range & training: Compact, fun-to-run platforms that are light on ammo costs when using pistol calibers.

• Custom builds: Ideal for builders wanting a unique, short AR pistol or a compact truck gun.

Buying checklist

• Confirm barrel length and gas system (piston vs. carbine/direct) match your intended build.

• Verify caliber compatibility with your lower and magazines.

• Check whether the upper includes BCG & charging handle or if those are sold separately.

• Ensure your planned setup complies with federal and state laws.

Why buy micro uppers from AR15-Overstock?

• Deep selection of dedicated uppers and micro-length barrels.

• Competitive pricing — get the upper you want without the premium.

• Fast shipping and reliable customer service.

• Blemished & clearance uppers available if you want savings over cosmetics. Browse micro uppers and related deals: Browse All Uppers • Blemished Uppers & Clearance

Final thought

A micro AR pistol upper is the best way to get a compact, capable firearm that still performs. Start by choosing the exact upper that matches your shooting style — whether that’s a 5" tack-driver or a balanced 7.5" setup — then build the rest around it.

Shop micro and compact uppers → Browse Uppers
Explore 5" uppers → 5" Uppers
Explore 7.5" uppers → 7.5" Uppers