AR-STONER AR-15 A3 Upper Receiver Assembly 5.56x45mm NATO 1 in 7″ Twist 20″ Government Contour Barrel

Cartridge
5.56x45mm NATO
Finish
Black Parkerized
Material
Aluminum
Weight
5.81 Pound
Barrel Length
20 Inches
Twist
1:7 Inches
Threads
1/2″-28
Barrel Contour
Government
Barrel Finish
Black Parkerized
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
4140 Chrome Moly Steel
Handguard
2-Piece M4 Style
Bolt Carrier Assembly Included
Yes
Muzzle Device
Flash Hider
Mil-Spec or Commercial
Mil-Spec
Country of Origin
United States of America
Compatible With
AR-15