5.56 Left Handed m16 BCG – Lefty Ar15 Bolt Carrier Group – Nitride

5.56 Left Handed M16 Bolt Carrier Group (BCG) – Lefty AR-15 Nitride

Designed specifically for left-handed shooters, the 5.56 Left Handed M16 Bolt Carrier Group from Mid State Firearms delivers reliable performance with proper left-side ejection. Finished in a durable black nitride (QPQ) coating, this lefty AR-15 BCG offers smooth cycling, corrosion resistance, and easy cleaning for duty, range, or builder rifles.

Unlike standard right-hand components, this bolt carrier group is purpose-built for left-hand ejecting AR-15 upper receivers, ensuring correct extractor and ejector geometry. The M16 / full-auto carrier profile provides added mass for consistent operation across a wide range of 5.56 NATO and .223 ammunition.

Whether you’re finishing a dedicated left-hand AR build or upgrading an existing rifle, this BCG is a critical component you can rely on.

Key Features

• Left-handed 5.56 / .223 bolt carrier group
• Designed for left-hand ejecting AR-15 uppers
• M16 / full-auto carrier profile
• Black nitride (QPQ) finish for durability and corrosion resistance
• Properly staked gas key
• Smooth cycling and easy maintenance

Specifications

• Caliber: 5.56 NATO / .223 Remington
• Handedness: Left
• Carrier Style: M16 / Full Auto
• Finish: Black Nitride
• Compatibility: Left-hand AR-15 uppers only

Note: This bolt carrier group will not function in standard right-hand AR-15 upper receivers.

Complete Your Left-Hand Build

• View all Left Handed BCGs:
  https://midstatefirearms.com/product-category/ar15-ar10/upper-receivers-parts/bolt-carrier-groups/left-handed-bcgs/
• Left Handed Builder Bundle (Upper + BCG):
  https://midstatefirearms.com/product/left-handed-builder-bundle-receiver-and-bcg/
• Left Handed Builder Bundle with Nitride BCG:
  https://midstatefirearms.com/product/ar15-left-handed-builder-bundle-receiver-and-nitride-bcg-combo/

Built for left-handed shooters who want proper ejection, smoother operation, and dependable performance — this Left Handed 5.56 M16 BCG is a must-have for any lefty AR-15 setup.