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Questions & Answers
Customer Reviews
Helpful Positive Review
Rainier Arms select 18” by Greeks-R-Best, March 14, 2024
This is my third RA barrel and their quality is top notch, I highly recommend their barrels. OP listed the item in back stock and said it would be 4-6 weeks for delivery and delivered in about 4 weeks. They gave me about a 12% discount on the barrel ...
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1/1 found this helpful
Helpful Positive Review
10.5" excellence by Donald Sampson, Verified Owner, October 4, 2025
Bought the 10.5" select barrel to replace a no name barrel on my K&M Tactical 10.5" upper. I had no expectation of this barrel being anything but mediocre, since it is a 10.5" 5.56 barrel..... When I took it to the range, I was blown away. With a 1-4...
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1/1 found this helpful
Most Recent Reviews
So good I bought another by Donald Sampson, Verified Owner, December 29, 2025
I bought a 10.5" select barrel to replace a barrel on my pistol upper and liked it so much I bought this 18" select barrel for another rifle. It did not disappoint. Sub MOA at 100 yards. Rainier is now my go to barrel provider.
Read All 3 Reviews
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Product Info for Rainier Arms AR Select 5.56 NATO Barrel

Many have asked us to build a barrel with the same workmanship as our Match barrels while keeping it more affordable. They are able to reach our goal by sourcing a very high end barrel blank at an affordable price. They start off using a high precision match blank in 1:7 twist, use a 5 groove polygonal rifling, machine it to the highest quality, you have a barrel that is the best value, hands down, in the industry.image

Specifications for Rainier Arms AR Select 5.56 NATO Barrel:

Manufacturer: Rainier Arms
Color: Black
Fabric/Material: Stainless Steel
Caliber: 5.56x45mm NATO
Barrel Profile: M4
Gas Block Journal Size-Diameter: .750 in
Barrel Twist Rate: 1-7
Gun Make: AR Platform
Gun Model: AR-15
Condition: New
Firearms Threads Per Inch: 1/2x28

Package Contents:

  • Rainier Arms Select 5.56 NATO Barrel

Rainier Arms AR Select 5.56 NATO Barrel Orderable Models

List of Orderable Models

  • Rainier Arms Select 5.56 NATO Barrel, 18in, 1-7 Twist, 1/2x28, Black, Medium, RAB-SEL-556-18-R-NF-BLK , MPN: RAB-SEL-556-18-R-NF-BLK , UPC: 744985350940 , Code: 4ZM-ATB-S1-RAB-SEL-556-18-R-NF-BLK
  • Rainier Arms Select 5.56 NATO Barrel, 14.5in, 1-7 Twist, 1/2x28, Black, Small, RAB-SEL-556-145-M-NF-BLK , MPN: RAB-SEL-556-145-M-NF-BLK , UPC: 744985350919 , Code: 4ZM-ATB-S1-RAB-SEL-556-145-M-NF-BLK
  • Rainier Arms Select 5.56 NATO Barrel, 16in, 1-7 Twist, 1/2x28, Black, Medium, RAB-SEL-556-16-M-NF-BLK , MPN: RAB-SEL-556-16-M-NF-BLK , UPC: 744985350926 , Code: 4ZM-ATB-S1-RAB-SEL-556-16-M-NF-BLK

Rainier Arms AR Select 5.56 NATO Barrel Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Rainier Arms Select 5.56 NATO Barrel, 16in, 1-7 Twist, 1/2x28, Black, Medium, RAB-SEL-556-16-M-NF-BLK , MPN: RAB-SEL-556-16-M-NF-BLK-EDEMO , Code: 4ZM-ATB-S1-RAB-SEL-556-16-M-NF-BLK-EDEMO-RE-A
  • Rainier Arms Select 5.56 NATO Barrel, 10.5in, 1-7 Twist, 1/2x28, Black, Small, RAB-SEL-556-105-C-NF-BLK , MPN: RAB-SEL-556-105-C-NF-BLK , UPC: 744985350889 , Code: 4ZM-ATB-S1-RAB-SEL-556-105-C-NF-BLK
  • Rainier Arms Select 5.56 NATO Barrel, 12.5in, 1-7 Twist, 1/2x28, Black, Small, RAB-SEL-556-125-C-NF-BLK , MPN: RAB-SEL-556-125-C-NF-BLK , UPC: 744985350902 , Code: 4ZM-ATB-S1-RAB-SEL-556-125-C-NF-BLK
  • Rainier Arms Select 5.56 NATO Barrel, 11.5in, 1-7 Twist, 1/2x28, Black, Small, RAB-SEL-556-115-C-NF-BLK , MPN: RAB-SEL-556-115-C-NF-BLK , UPC: 744985350896 , Code: 4ZM-ATB-S1-RAB-SEL-556-115-C-NF-BLK
  • USED Rainier Arms Select 5.56 NATO Barrel, 10.5in, 1-7 Twist, 1/2x28, Black, Small, RAB-SEL-556-105-C-NF-BLK, EDEMO1, Condition Parts Only/Salvage, Wrong Product , MPN: RAB-SEL-556-105-C-NF-BLK-EDEMO1 , Code: 4ZM-ATB-S1-RAB-SEL-556-105-C-NF-BLK-EDEMO-WP-F
  • Open Box, Dealer Demo, Rainier Arms Select 5.56 NATO Barrel, 10.5in, 1-7 Twist, 1/2x28, Black, Small, RAB-SEL-556-105-C-NF-BLK , MPN: RAB-SEL-556-105-C-NF-BLK-DMO , Code: 4ZM-ATB-S1-RAB-SEL-556-105-C-NF-BLK-DMO
  • Rainier Arms Select 5.56 NATO Dissipator Barrel, 16in, 1-7 Twist, 1/2x28, Black, Medium, RAB-SEL-556-16-R-NF-BLK , MPN: RAB-SEL-556-16-R-NF-BLK , UPC: 744985350933 , Code: 4ZM-ATB-S1-RAB-SEL-556-16-R-NF-BLK
  • Rainier Arms Select 5.56 NATO M16A1 Barrel, 20in, 1-7 Twist, 1/2x28, Black, Medium, RAB-SEL-556-20-R-M16A1-NF-BLK , MPN: RAB-SEL-556-20-R-M16A1-NF-BLK , UPC: 744985350957 , Code: 4ZM-ATB-S1-RAB-SEL-556-20-R-M16A1-NF-BLK
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