Ar15 Left Handed Builder Bundle – Billet Slick Side Receiver and Nitride BCG Combo
Looking to build a true left-handed AR-15 or convert your current rifle to eject to the left? This Lefty Builder Bundle gives southpaw shooters the reliability, fitment, and performance they’ve always wanted—without hunting for compatible parts. This combo includes a Billet Slick Side Left Hand Upper Receiver and an MSF Left Hand Nitride M16 Bolt Carrier Group, engineered to run flawlessly with popular calibers including 5.56 NATO, .223 Wylde, .300 Blackout, and .350 Legend.
Whether you’re upgrading an existing rifle or launching a fresh left-hand AR15 build, this bundle provides the correct geometry and mirrored components needed for proper left-side ejection.
Product Features
Billet Slick Side Flat-Top Left Hand Upper Receiver
- True left-hand ejection port
- Slick side design – no forward assist or dust cover
- Precision-machined billet construction
- Flat-top Picatinny rail for optics and accessories
- Perfect foundation for minimalist left-hand AR builds
MSF Left Hand Nitride M16 Bolt Carrier Group
- Left-eject M16-cut BCG
- Nitride finish for smooth cycling & durability
- Compatible with 5.56 / .223 / .300BLK / .350 Legend bolt face
- Built to MSF quality standards
- Ready for drop-in installation
Why Choose a Left-Handed Upper?
- Ideal for left-hand dominant shooters
- Keeps brass ejecting away from your face
- Improves ergonomics and shooting comfort
- Enhances control and follow-up shot speed
- No need for brass deflectors or awkward shooting positions
Perfect For:
- Left-handed AR-15 builds
- Converting an existing rifle to left-side ejection
- Slick-side, minimalist builds
- Builders wanting a matched MSF-quality combo
Related Products
Lefty Southpaws Rejoice!
Get the proper left-hand configuration your rifle deserves. Upgrade your comfort, performance, and shooting experience with this purpose-built Left Handed AR15 Receiver + BCG Combo — only from Mid State Firearms.
-300x300.jpg "Left Hand Nickel Boron BCG M16 / Ar15 Bolt Carrier Group, photo")
-300x300.png "15' Gen1 Free Float Quad Rail, photo")
sound of freedom – This was a great set up. I loved being able to customize the set up. Only issue I had was my own fault as a newb to building these. I used a heavy barrel in a slim hand guard. It makes adding attachments tough with clearances. Hoping someday to also get an AR10 from here.