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Rainier Arms AR Ultramatch MOD2 300BLK Barrel Up to 10% Off — Free 2 Day Shipping w/ code 2DAYAIR — 4 models

Special offer available for this product. Click here to see!
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
1 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
2 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
3 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
4 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
5 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
6 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
7 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
8 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
9 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
10 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
11 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
12 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
13 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
14 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
15 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
16 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
17 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
18 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
19 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
20 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
21 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
22 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
23 of 24 images
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL
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Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL

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Questions & Answers
Does this come with the gas tube and gas block?

No barrel is sold with gas tube or gas block. You would need to buy complete uppers for that.

by Zach, Verified Owner, October 29, 2025
View All Q&A You Have a Question? Ask!

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Product Info for Rainier Arms AR Ultramatch MOD2 300BLK 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 300BLK Barrel:

Manufacturer: Rainier Arms
Color: Silver
Fabric/Material: Stainless Steel
Caliber: .300 AAC Blackout
Barrel Profile: M4
Gas System Length: Pistol Length
Gas Block Journal Size-Diameter: .750 in
Threads per Inch: 5/8x24
Barrel Twist Rate: 1-7.5
Gun Make: AR Platform
Gun Model: AR-15

Package Contents:

  • Rainier Arms Ultramatch MOD2 300BLK Barrel

What firearm models does the manufacturer say Rainier Arms AR Ultramatch MOD2 300BLK Barrel is compatible with?

The manufacturer says that Rainier Arms AR Ultramatch MOD2 300BLK Barrel is compatible with AR-15

Rainier Arms AR Ultramatch MOD2 300BLK Barrel Orderable Models

List of Orderable Models

  • Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Polished, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-POL , MPN: RAB-UM2-300-10-P-FF-POL , UPC: 744985351404 , Code: 4ZM-ATB-CPO35-RAB-UM2-300-10-P-FF-POL
  • Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Satin, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-SAT , MPN: RAB-UM2-300-16-P-FF-SAT , UPC: 744985351435 , Code: 4ZM-ATB-CPO35-RAB-UM2-300-16-P-FF-SAT
  • Rainier Arms Ultramatch MOD2 300BLK Barrel, 10in Satin, 1-7.5 Twist, 5/8x24, Silver, Small, RAB-UM2-300-10-P-FF-SAT , MPN: RAB-UM2-300-10-P-FF-SAT , UPC: 744985351411 , Code: 4ZM-ATB-CPO35-RAB-UM2-300-10-P-FF-SAT
  • Rainier Arms Ultramatch MOD2 300BLK Barrel, 16in Polished, 1-7.5 Twist, 5/8x24, Silver, Medium, RAB-UM2-300-16-P-FF-POL , MPN: RAB-UM2-300-16-P-FF-POL , UPC: 744985351428 , Code: 4ZM-ATB-CPO35-RAB-UM2-300-16-P-FF-POL
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