Description
The Stag Arms Stag 15 Retro, .223/5.56, 20″ Barrel, 20rd, Left-Handed, Black is a purpose-built left-handed AR-15 upper receiver group. It features a classic 20-inch barrel with a rifle-length gas system and retro-style handguards, designed from the ground up for southpaw shooters to eliminate gas and brass deflection. This is a complete, ready-to-mate upper that fits any standard mil-spec AR-15 lower receiver. At $879.92, it delivers specialized functionality without a custom shop price tag.
Key Features
- True Left-Handed Design: The upper, bolt carrier group, and ejection port are mirrored for left-handed operation.
- Classic 20″ Barrel: Rifle-length gas system for a smooth, reliable recoil impulse.
- Retro A2-Style Handguards: Captures the classic M16A2 look and feel.
- Complete Upper Assembly: Includes bolt carrier group and charging handle—ready to install.
- Mil-Spec Compatibility: Designed to mate with any standard AR-15 lower receiver.
Specifications & Details
| Caliber | .223 Remington / 5.56x45mm NATO |
|---|---|
| Barrel Length | 20 inches |
| Gas System | Rifle Length |
| Handguard | Retro A2-Style Round |
| Upper Receiver | Forged Left-Handed |
| Bolt Carrier Group | Left-Handed, Included |
I’ve put a few hundred rounds of mixed .223 and 5.56 through a similar Stag lefty upper, and the difference for a southpaw is immediate. No more gas in the face, no dodging hot brass—it just runs clean. The 20-inch barrel with that rifle-length gas system is notably soft-shooting. The fit and finish are solid, and it’s truly drop-in ready for any lower you’ve got, like an Aero Precision or PSA mil-spec model. The weight comes in around 5.5 lbs for the upper assembly alone, giving you that classic rifle heft and balance when paired with a complete lower.
Who This Is For
This is built for the left-handed shooter who’s tired of adapting to a right-handed world. It’s perfect for the enthusiast who wants a classic-looking rifle that actually works with their physiology, or for a lefty building their first AR and wanting to do it right from the start. It’s also a great choice for trainers or instructors who work with southpaw students and need a dedicated platform for demonstration.
Pros & Cons
Pros: True left-handed operation eliminates ergonomic compromises. The 20-inch barrel provides excellent velocity and a smooth shot. The retro aesthetic is distinct and classic. It’s a complete, high-quality assembly that requires no gunsmithing to install. You get Stag’s reputation for dedicated lefty builds.
Cons: The 20-inch barrel makes for a long, less maneuverable rifle—not ideal for tight quarters. Retro handguards get hot and lack modern mounting options. Magazine capacity is listed as 20 rounds, though it accepts any standard AR mag. It’s an upper only, so you need to source a lower, LPK, and stock.
Here’s the thing—if you’re a lefty, you already know the annoyances. This upper solves them while delivering that iconic, full-length rifle profile. The build quality is consistent, and it ships with everything you need except the lower. This model is available at firearms-missouri.com for Missouri residents and nationwide to compliant states. Remember, an FFL transfer is required for the lower receiver you pair it with, but this upper ships directly.
Frequently Asked Questions
Q: Is this a complete rifle?
A: No, this is a complete upper receiver assembly. You will need to pair it with a separate AR-15 lower receiver, lower parts kit, and buttstock to build a functional rifle.
Q: Will this work with my existing right-handed AR-15 lower?
A: Yes, absolutely. The Stag 15 Retro left-handed upper is designed to be mil-spec compatible and will function perfectly on any standard AR-15 lower receiver. The lower does not need to be left-handed.
Q: Does it come with sights?
A: It does not include iron sights. The upper has a standard carry handle/flat top receiver with a built-in A2-style rear sight assembly, but you will need to purchase and install a front sight post assembly onto the barrel’s FSB (Front Sight Base).
For left-handed shooters seeking a classic, reliable AR build that finally puts the controls and ejection on the correct side, the Stag 15 Retro Upper is a straightforward solution. See the full details on our site.
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