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Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel Up to 15% Off, Blazin' Deal w/ Free S&H — 4 models

Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
20 of 24 images
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL
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Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL

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Questions & Answers
I just purchased this barrel 18 in. 6mm arc and I can say for a fact it is not a rifle length +2. Going with a +1 rifle length. YMMV 6.5c was a +2

Yes, I own the 18" and 22" UltraMatch 6mm Arc barrels. The 18" is rifle+1 gas and the 22" is rifle+2.

by Ryan Weddle, Verified Owner, January 14, 2025
See 1 More Answer
It says the gas system is proprietary. What gas tube length do I need to order? Expert Answer

The Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel uses a Rifle + length gas system and would require a Rifle + gas tube.

by Ethan, Gear Expert, October 7, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
6 ARC Rainier Barrel by Bidenlover, Verified Owner, June 30, 2024
Ordered this barrel which was easy to mount and dimple. Used a Grendel bolt and carrier II. Headspace Excellent. Performed awesome at the range. Really shines on the long ranges. No problem getting this out to 1000 yards. It's a better barrel than ...
Read More...
5/6 found this helpful
Most Recent Reviews
Poor Packaging for the Price by J, Verified Owner, July 22, 2025
Be aware that this “ultra match grade” barrel does not come in a vendor box. One wrap of bubble wrap held together with an item label. Still waiting on gas tube that was missing from the order to shoot it.
0/3 found this helpful
Most Recent Reviews
so far so good by Justanotherday, Verified Owner, September 17, 2023
Because of my complied lifestyle, I havnt yet put the build this barrel is intended for together yet, but the price was right and it arrived quickly. Hope I can update on quality and performance later on
0/22 found this helpful
Most Recent Reviews
Great performance for a solid price by Thomas Towns, Verified Owner, August 11, 2025
This was my first endeavor into 6mm arc and it was kinda difficult to find a review for any of the 6 arc options out there. I ended up going with this ranier based off of the companies reputation and I’m glad I did. It’s a laser right out of the box....
Read More...
Read All 4 Reviews
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Product Info for Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel

Introducing their MOD2 UltraMatch barrel using the finest blank. Their goal is to mass produce them to bring them to market at the most competitive prices. They wanted the best balance between accuracy while keeping the weight down as much as possible.image

Specifications for Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel:

Manufacturer: Rainier Arms
Color: Silver
Caliber: 6mm ARC
Barrel Profile: M4
Threads per Inch: 5/8x24
Barrel Twist Rate: 1-7
Barrel Material: Stainless Steel
Flutes: Yes
Gun Make: AR Platform
Gun Model: AR-15
Condition: New
Gas Block Journal Size-Length: 1 in
Gas System Type: Proprietary

Features of Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel

  • TiN Extension
  • M4 Feed Ramps
  • Proprietary Contour

Package Contents:

  • Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel

What firearm models does the manufacturer say Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel is compatible with?

The manufacturer suggests that Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel is compatible with AR-15

Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel Orderable Models

List of Orderable Models

  • Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-SAT , MPN: RAB-UM2-6ARC-22-R2-FF-SAT , UPC: 744985352050 , Code: 4ZM-ATB-CPO38-RAB-UM2-6ARC-22-R2-FF-SAT
  • Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 22in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-22-R2-FF-POL , MPN: RAB-UM2-6ARC-22-R2-FF-POL , UPC: 744985352067 , Code: 4ZM-ATB-CPO38-RAB-UM2-6ARC-22-R2-FF-POL
  • Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Satin, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-SAT , MPN: RAB-UM2-6ARC-18-R1-FF-SAT , UPC: 744985351510 , Code: 4ZM-ATB-CPO38-RAB-UM2-6ARC-18-R1-FF-SAT
  • Rainier Arms UltraMatch MOD2 6mm ARC Rifle Barrel, 18in Polished, 1-7 Twist, 5/8x24, Silver, Medium, RAB-UM2-6ARC-18-R1-FF-POL , MPN: RAB-UM2-6ARC-18-R1-FF-POL , UPC: 744985351503 , Code: 4ZM-ATB-CPO38-RAB-UM2-6ARC-18-R1-FF-POL
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