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AR-STONER AR-15 A3 Pistol Upper Receiver Assembly 300 AAC Blackout 7.5″ Barrel 7″ M-LOK Ultralight Handguard



Product Information

Cartridge 300 AAC Blackout (7.62x35mm)
Finish Matte Black
Material Aluminum
Weight 3.375 Pound
Barrel Length 7.5 Inches
Twist 1:8 Inches
Threads 5/8″-24
Barrel Contour Heavy
Sights No
Barrel Finish Parkerized
Chrome Lined No
Gas Block Diameter 0.75 Inches
Gas System Length Pistol
Upper Receiver Type A3 Flat-Top
Barrel Material Steel
Handguard M-LOK
Bolt Carrier Assembly Included Yes
Muzzle Device Flash Hider
Mil-Spec or Commercial Mil-Spec
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight

3.985 Pounds

Product Overview

The AR-STONER AR-15 A3 Upper Receiver Assembly chambered in 300 AAC Blackout is ready to be assembled to a complete lower and fired! This AR-STONER upper features a pistol gas system for use with supersonic or subsonic ammo, a mil-spec bolt carrier group, a 7.5” medium contour barrel , 7” free float, AR-Stoner M-Lok handguard.

Securely mount popular accessories directly to the precision M-Lok cutouts and attach your sling to the integrated QD mounts with this optimum handguard. This sleek and ergonomic free float handguard meets shooters needs without sacrificing strength and performance.

The A3 upper assembly 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 sights, this upper is a great platform for a red dot sight or iron sights (both sold separately).


  • Complete Bolt Carrier Group
  • 7″ M-Lok Ultralite Handguard
  • 7.5” Barrel
  • Flash Hider

Made In United States of America

WARNING: Cancer and Reproductive Harm –


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