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AR-STONER AR-15 A3 Upper Receiver Assembly 450 Bushmaster 16″ Barrel 15″ Ultralight M-LOK Handguard



Product Information

Cartridge 450 Bushmaster
Color Black
Finish Anodized
Material Aluminum
Weight 4.8 Pound
Barrel Length 16 Inches
Twist 1:24 Inches
Threads 5/8″-32
Barrel Contour Heavy
Barrel Finish Parkerized
Chrome Lined No
Gas Block Diameter 0.875 Inches
Gas System Length Carbine
M4 Feed Ramps No
Upper Receiver Type A3 Flat-Top
Barrel Material 4150 Chrome Moly Vanadium Steel
Handguard 15″ Ultralight M-LOK
Bolt Carrier Assembly Included Yes
Muzzle Device Flash Hider
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight

5.880 Pounds

Product Overview

This AR-STONER Rifle length upper features a 450 Bushmaster bolt carrier group, parkerized finish, low profile gas block, 16″ barrel, 15″ Ultralight M-LOK handguard and a heavy 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, 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).


  • 450 Bushmaster Bolt Carrier Group
  • 15″ Ultralight M-LOK Handguard
  • 16″ 1:24″ Twist Barrel

Made In United States of America

WARNING: Cancer and Reproductive Harm –


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