5'' 5.56 NATO 1:5 5R Twist Nitride Pistol Barrel and Micro Gas Tube and Gas Block Options| Made in U.S.A

Barrel Features:

Length: 5" 

5.56 Nato

1:5 5R Twist

.750" Gas Block Diameter

Proprietary Micro Pistol gas system

Thread Pitch 1/2"X28

4150 Chrome Moly Vanadium

Finish: Black Nitride Finish

Made in USA

Fits: Ar-15

Notice: Proprietary gas tube will be needed to make this barrel function

Micro Gas Tube Features: 

Proprietary gas tube made for MICRO gas System 

Smaller than Pistol length gas tube 

Length: 5 7/8 

OD: 0.180 on button end 

Material: Stainless Steel 

Included: Roll pin 

Gas Block Options

.750 Adjustable: GB750US-ADJ

.750 Standard: GB01-B

.750 Standard Stainless: GB01-S

.750 Clamp on: GB06

.750 Clamp on Stainless: GB06-S

.750 Standard Caged Black: GBUS

.750 Standard Caged Stainless: GBUS-S