Ar15 Left Handed Builder Bundle – Upper Receiver and Nickel BCG Combo

Want an AR-15 to eject to the left? The only thing that is different is the upper receiver and BCG. Here they are! Convert your old rifle, or start a new build! Includes Left hand ejection receiver and m16 left hand nickel boron bolt carrier group.

• Aero / Stag15 A3 Flat top Left Hand Upper Receiver, with dust cover and forward assist
• MSF Left Hand Nickel Boron M-16 Bolt Carrier Group
• 5.56/.223/.300Blk/.350Legend caliber bolt face

Left-Handed Builder Bundle – AR-15 Left Eject Upper & BCG

Designed for Southpaws, Built for Precision.
Tired of hot brass flying across your face? Ready to build an AR-15 that truly works with you—not against you? The Left-Handed Builder Bundle is your foundation for a dedicated left-hand eject rifle. Whether you’re converting an existing firearm or starting from scratch, this combo delivers the core components you need to get it right the first time.

This bundle includes a left-hand eject Aero/Stag15 A3 flat top upper receiver with dust cover and forward assist, and our MSF Left-Hand Nickel Boron M16 Bolt Carrier Group—precision matched for flawless operation and reliable cycling.

🔧 Bundle Includes:

• Aero / Stag15 A3 Flat Top Left-Hand Upper Receiver
  Built to mil-spec standards and ready for your next build. Includes dust cover and forward assist.
  • Forged 7075-T6 aluminum
  • Type III hardcoat anodized
  • Accepts all standard AR-15 barrel nuts, rails, and charging handles
  • Browse all Upper Receivers »
• MSF Left-Hand Nickel Boron M16 Bolt Carrier Group
  Engineered for durability and ease of maintenance. Nickel Boron coating ensures smooth cycling and corrosion resistance.
  • Full-auto rated, left-hand ejection
  • Compatible with 5.56/.223, .300 Blackout, and .350 Legend
  • Magnetic Particle Inspected (MPI)
  • Shop All Bolt Carrier Groups »

🔄 Pro Tip: Pair It with an Ambidextrous Charging Handle

Make your left-handed build even more ergonomic by adding an ambidextrous charging handle. It allows fast, comfortable charging from either side—especially useful in dynamic shooting positions or under stress.
Check out our selection of Ambidextrous Charging Handles »

✅ Build It Your Way

Pair this bundle with any of our AR-15 Barrels, Handguards, and Lower Receivers & Kits to complete your dream southpaw build.

🎯 Ideal For:

• Left-handed shooters who demand better ergonomics
• Converting standard ARs to a left-eject configuration
• Custom rifle builds that don’t compromise on comfort or function

🛠️ Upgrade your rifle the left way—grab your Left-Handed Builder Bundle today.
Shop Now at MidstateFirearms.com – because your build should fit you.