AR-STONER AR-15 Side Charging Upper Receiver Assembly Gen 2 12.7x42mm 16″ Barrel 15″ M-LOK Ultralight Handguard


Category: Product ID: 18988


The AR-STONER AR-15 Side Charging Upper Receiver Assembly Gen 2 is chambered in 12.7×42 and delivers precision accuracy at an affordable price. The machined billet aluminum upper receiver is combined with an extruded aluminum free float M-LOK handguard and both are hard coat anodized.

This complete upper features a carbine-length gas system, bolt carrier group, 16” heavy profile barrel with a matte finish and a lightweight 15” free float AR-Stoner M-LOK handguard and a flash hider.

Attach your favorite sling to the free float handguard with integrated QD mounts and use the precision M-LOK cutouts at the three, six, and nine o’clock positions for mounting MIL-STD 1913 Picatinny rails or other direct-attach M-LOK accessories.


  • Gen 2 Bolt Handle
  • Chambered in 12.7x42mm
  • 16″ Heavy Contour Barrel

Made In United States of America

WARNING: Cancer and Reproductive Harm –


Product Information

Cartridge 12.7x42mm
Finish Matte
Material Aluminum
Weight 5.1 Pound
Barrel Length 16 Inches
Twist 1:20 Inches
Threads 49/64″-20
Barrel Contour Heavy
Sights No
Barrel Finish Parkerized
Chrome Lined No
Gas Block Diameter 0.936 Inches
Gas System Length Carbine
Upper Receiver Type Side Charging Gen 2
Barrel Material 4150 Chrome Moly Vanadium Steel
Handguard 15″ M-LOK
Bolt Carrier Assembly Included Yes
Muzzle Device Flash Hider
Mil-Spec or Commercial Commercial
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight 6.060 Pounds


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