AR-STONER AR-15 A3 Upper Receiver Assembly 350 Legend 16″ Barrel with 15″ M-LOK Ultralight Handguard


Category: Product ID: 13270


MidwayUSA is proud to offer this AR-STONER 350 Legend Upper Receiver Assembly at an exceptional price! This AR-STONER upper features a 350 Legend bolt carrier group, parkerized finish, low profile gas block, and a M4 profile barrel. The A3 upper will attach to virtually any standard AR-15 lower receiver and comes complete with charging handle, forward assist, ejection port cover, A2 flash hider, bolt and bolt carrier assembly. Supplied without a rear sight, this upper is a great platform for a red dot sight or iron sights (both sold separately).


  • 16″ Parkerized 4150 Chrome Moly Vanadium Barrel with 1:16 Twist
  • M4 Contour Barrel
  • 15″ MLOK Rail
  • Rear Charging
  • Carbine Length Gas System
  • .346″ bore with a .355″ groove

Note: this upper receiver does not come with a magazine

Made In United States of America

WARNING: Cancer and Reproductive Harm –


Product Information

Color Black
Finish Anodized
Material Aluminum
Weight 3.9 Pound
Barrel Length 16 Inches
Twist 1:16 Inches
Threads 5/8″-24
Barrel Contour M4
Barrel Finish Parkerized
Chrome Lined No
Gas Block Diameter 0.75 Inches
Gas System Length Carbine
M4 Feed Ramps Yes
Upper Receiver Type A3 Flat-Top
Barrel Material 4150 Chrome Moly Vanadium Steel
Handguard 15″ M-Lok Ultralight
Bolt Carrier Assembly Included Yes
Muzzle Device Flash Hider
Country of Origin United States of America

Delivery Information

Shipping Weight 5.060 Pounds


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