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AR-STONER LR-308 A3 Upper Receiver Assembly 308 Winchester 20″ Stainless Steel Fluted Barrel 15″ M-LOK Ultralight Handguard



Product Information

Cartridge 308 Winchester
Finish Matte
Material Aluminum
Extra Features Fluted
Weight 6.35 Pound
Barrel Length 20 Inches
Twist 1:10 Inches
Threads 5/8″-24
Barrel Contour SOCOM
Sights No
Barrel Finish Stainless
Chrome Lined No
Gas Block Diameter 0.75 Inches
Gas System Length Rifle
M4 Feed Ramps Yes
Upper Receiver Type A3 Flat-Top
Barrel Material 416R Stainless Steel
Handguard 15″ M-LOK Ultralight
Bolt Carrier Assembly Included Yes
Muzzle Device Flash Hider
Mil-Spec or Commercial Commercial
Country of Origin United States of America
Compatible With
AR-10, LR-308

Delivery Information

Shipping Weight

7.225 Pounds

Product Overview

The AR-Stoner LR-308 A3 Upper Receiver Assembly chambered in 308 Winchester is ready to be assembled to a complete lower and fired! This LR-308 billet upper features a bolt carrier group, a SOCOM contour 20” barrel and an Ultralight 15” free float M-Lok handguard. Securely mount popular accessories directly to the precision M-Lok cutouts. This sleek and ergonomic free float handguard meets shooters needs without sacrificing strength and performance. The AR-STONER LR-308 Upper is patterned after DPMS and will work with DPMS style parts/lowers.

The A3 upper assembly comes complete with charging handle, forward assist, ejection port cover, flash hider, bolt and bolt carrier assembly. Supplied without sights, this upper is a great platform for a precision scope or iron sights (both sold separately).


  • Complete Bolt Carrier Group
  • 15″ Ultralight M-Lok Handguard
  • Fluted
  • 20” Barrel
  • 1:10 Twist
  • Rifle-Length Gas System
  • Flash Hider

Made In United States of America

WARNING: Cancer and Reproductive Harm –


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