AR-15 300BLK – 7.5" LENGTH 1:7 TWIST W/ 7" SLIM M-LOK HANDGUARD NO Assembly Required With BCG and Charging Handle

This is a complete, ready-to-shoot AR-15 upper receiver chambered in 300 Blackout with a 7.5″ barrel. Designed for builders who value convenience and performance, it comes fully assembled with a Bolt Carrier Group and Charging Handle, so you can attach it to your AR-15 lower and be ready to go. The compact 7.5″ barrel length is ideal for maximizing the 300BLK cartridge’s potential in a short-barreled rifle (SBR) or pistol configuration, making this a top-tier choice for a home defense or compact hunting build.

Key Features

• 7.5″ Barrel with 1:7 Twist Rate: Optimally stabilizes both heavy subsonic and lighter supersonic 300 Blackout ammunition.
• Complete, No-Assembly Required Upper: Includes a matched Bolt Carrier Group (BCG) and Charging Handle for immediate function.
• 7″ Slim M-LOK Handguard: Provides a lightweight, secure grip with extensive modularity for mounting lights, lasers, and vertical grips.
• 300 Blackout Caliber: Delivers formidable stopping power from a short barrel, superior to 5.56 NATO in compact systems.
• Gas Block & Tube Included: Properly installed and aligned for reliable cycling right out of the box.

Built For

This upper is built for the shooter who wants a dedicated, hard-hitting 300 Blackout platform without the hassle of sourcing and assembling parts. It’s perfect for constructing a legally compliant AR pistol or a suppressed SBR for home defense, tactical training, or hunting medium game at close to intermediate ranges.

Specifications

• Caliber: 300 AAC Blackout
• Barrel: 7.5″ Length, 1:7 Twist, Carbon Steel with Protective Finish
• Handguard: 7″ Slim Profile M-LOK Aluminum
• Compatibility: Fits Mil-Spec AR-15 Lower Receivers
• Included: Complete Upper Receiver, BCG, Charging Handle

FAQ

Is this upper compatible with any AR-15 lower?
Yes, this upper receiver is built to standard mil-spec dimensions and will mate correctly with any mil-spec AR-15 lower receiver. You will need to ensure your lower is configured for the 300 Blackout cartridge.

Can I use standard 5.56 magazines with 300 Blackout?
Yes, 300 Blackout rounds are designed to function in standard 5.56/.223 magazines. We recommend clearly marking your magazines to avoid dangerous ammunition mix-ups with 5.56 rifles.