Description

Buy Rock River Arms AR-15 A4 Upper Receiver Assembly 450 Bushmaster 20″ Chrome Moly Barrel 15″ Handguard Black Online

The Rock River Arms AR-15 Upper Receiver Assembly is designed to pin onto any mil-spec lower receiver. Just add an optic, or set of sights, and you are ready to send lead downrange!

Features

Flattop upper receiver
Mil-spec compatible
Anodized finish

Specifications

Product Information

Cartridge	450 Bushmaster
Color	Black
Finish	Anodized
Material	Aluminum
Extra Features	Includes One 5 Round Magazine
Barrel Length	20 Inches
Barrel Material	4150 Chrome Moly Steel
Barrel Finish	Black
Twist	1:24 Inches
Threads	5/8″-32
Sights	No
Chrome Lined	No
Gas Block Diameter	0.75 Inches
Gas System Length	Rifle
Upper Receiver Type	A4 Flat-Top
Bolt Carrier Assembly Included	Yes
Muzzle Device	RRA Operator Muzzle Brake
Country of Origin	United States of America
Compatible With	AR-15