RA LSW Upper Receiver (Flat Top/A4)
The RA-1-007 Upper comes fully equipped for maximum performance and versatility. Built with a heavy HBAR barrel (.750 FSP build), it features a real Light Support Weapon (LSW) handguard with heat shield installed , a TRI-AD rail on the front sight post, and an M1913 mount on the bottom rail for enhanced modularity. This upper delivers durability, heat management, and a rock-solid platform for mounting optics, grips, and other mission-critical accessories.
The RA-1-007 Upper comes fully equipped for maximum performance and versatility. Built with a heavy HBAR barrel (.750 FSP build), it features a real Light Support Weapon (LSW) handguard with heat shield installed , a TRI-AD rail on the front sight post, and an M1913 mount on the bottom rail for enhanced modularity. This upper delivers durability, heat management, and a rock-solid platform for mounting optics, grips, and other mission-critical accessories.
The RA-1-007 Upper comes fully equipped for maximum performance and versatility. Built with a heavy HBAR barrel (.750 FSP build), it features a real Light Support Weapon (LSW) handguard with heat shield installed , a TRI-AD rail on the front sight post, and an M1913 mount on the bottom rail for enhanced modularity. This upper delivers durability, heat management, and a rock-solid platform for mounting optics, grips, and other mission-critical accessories.
RA LSW Upper Receiver (Flat Top/A4)
- Introducing The RA LSW Upper Receiver – Built For Performance And Versatility
- The RA LSW upper receiver delivers solid performance from a modern yet classic AR platform.
- Ideal for range shooting, competitions, or training with all the features serious shooters need.
Built For Heavy-Duty Support
- The .750 FSP HBAR upper assembly handles long shooting sessions with accuracy and reliability.
- Heavy-barrel profile improves heat resistance and balance during rapid fire or mag dumps.
Key Features
- True heavy barrel design: .750" FSP profile for rock-solid stability.
- Superior heat resistance and less barrel whip for repeatable accuracy.
- Extra support for intense range days or high-volume shooting.
Modular And Mission-Ready
- TRI-AD rail upper receiver supports full customization.
- M1913 mount on bottom rail for quick grip or bipod attachment.
- Flat top A4 upper receiver allows mounting of red dots, scopes, or night vision.
Why Go Modular?
- Modular AR-15 upper receiver design allows quick part and accessory swaps.
- Grow your setup as your needs evolve.
- Perfect for competitive shooters, home defense, or custom builds.
Real Protection With A Heat-Managed Handguard
- LSW handguard with built-in heat shield protects hands during extended firing.
- Absorbs and disperses heat from the barrel for added comfort.
Heat Management Highlights
- Advanced Heat-managed upper receiver keeps things cooler, session after session.
- Perfect for high-volume fire and tactical training.
- Added comfort means better shooting confidence.
Built Tough – Ready For Every Mission
- Durable AR-15 upper assembly built for long-term use.
- Includes strong barrel and dependable Retro Arms RA-1-007 upper frame.
- Engineered for action, not just display.
Standout Durability
- Rugged construction in every component.
- Designed for consistent performance in any environment.
- All key parts ready for mission-critical use.
Flexible Mounting, Endless Possibilities
- M1913 mount and Flat top A4 receiver allow full optic and accessory setup.
- Top-notch modularity for mission-specific customization.
Mounting Advantages
- Secure fit for all standard AR accessories.
- Mount directly to the TRI-AD rail upper receiver for forward-mounted optics.
- Easy to reconfigure without tools.
Designed For Today's Shooter
- Mission-ready AR-15 upper shifts easily between different roles.
- Retro style for collectors with modern performance for builders.
User Benefits
- Smooth operation for left- or right-handed users.
- Classic design with modern upgrades.
- Premium support from the Retro Arms team.
What Makes The RA LSW Stand Out?
- Light Support Weapon upper receiver with Flat top A4 compatibility.
- Top accuracy and strength from the .750 FSP HBAR upper assembly.
- Flexible Modular AR-15 upper receiver for easy customization.
- LSW handguard with heat shield ensures comfort during long sessions.
- Ready for mounts, upgrades, and adventures.
Choose The RA LSW Upper Receiver
- Reliable, high-quality parts with the Retro Arms RA-1-007 design.
- Handles high-volume fire and stays cool with unique heat shielding.
- Full accessory compatibility for confident builds and endless customization.