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AR-STONER AR-15 Side Charging Upper Receiver Assembly 5.56x45mm 20″ Fluted Heavy Barrel 15″ M-LOK Ultralight Handguard



The AR-STONER™ AR-15 Side Charging Upper Receiver Assembly chambered in 5.56x45mm NATO is ready to attach to virtually any standard AR-15 lower receiver. The side charging handle allows shooters to maintain focus on their target while charging the weapon. The receiver is forged from aluminum and the entire receiver is then Type III hard coat anodized.

This AR-STONER™ Upper Receiver Assembly features a rifle length gas system, 20” heavy profile barrel with a parkerized finish, A2 flash hider, and a lightweight, 15” free float AR-Stoner M-Lok handguard. The M-Lok slots allow mounting of popular M-Lok compatible accessories directly to the precision cutouts. The handguard also features integrated QD sling mounts. This sleek and ergonomic free float handguard meets shooters’ needs without sacrificing strength and performance.

Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.




  • Side charging handle design
  • Increased rear scope clearance
  • Great for long range platforms
  • M-Lok handguard compatibility

Made In United States of America

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

Product Information

Cartridge 5.56x45mm NATO
Color Black
Finish Anodized
Material Aluminum
Barrel Length 20 Inches
Twist 1:7 Inches
Threads 1/2″-28
Barrel Contour Heavy
Barrel Finish Parkerized
Chrome Lined No
Gas Block Diameter 0.75 Inches
Gas System Length Rifle
M4 Feed Ramps Yes
Upper Receiver Type Side Charging
Barrel Material 4150 Chrome Moly Vanadium Steel
Handguard 15″ M-LOK Ultralight
Bolt Carrier Assembly Included Yes
Muzzle Device Flash Hider
Mil-Spec or Commercial Mil-Spec
Country of Origin United States of America
Compatible With


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