+1-800-504-5897 Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Rainier Arms AR Ultramatch MOD2 6.5 Creedmoor Barrel RAB-UM2-65CM-26-R2-FF-POL Color: Silver, Finish: Polished, $20.00 Off w/ Free Shipping

Special offer available for this product. Click here to see!
Limited Time Offer. Click here to see!
Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-POL
Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-POL
Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-POL
1 of 2 images
Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-POL
Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-POL
2 of 2 images
Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-POL

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
I bought this barrel but can’t get it into my DPMS AR-10 upper receiver. Do I need a different kind of receiver to get this barrel to fit into it?

If you go online you’ll see several mentions about this, as some barrel extensions vs receivers are a very tight fit for tolerances (which most think is a good thing), and how people had to GENTLY heat the receiver to get it to expand to fit the barrel. Check online!!

by Mije S, Verified Owner, November 25, 2024
Type of rifling? That is — 5R, or 6-E, or 3P, or some other? Rainer site does not say (I already asked their site too). Can you answer this question?
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
This is the barrel! by Drew, Verified Owner, July 6, 2024
Let me start with this is a beautiful barrel. I have the satin version but I can imagine that the polished version is a piece of art. I built a 6.5 CM precision rifle and I really wanted a barrel that has rifle+2 gas system. There are many barrels ou...
Read More...
7/7 found this helpful
Most Recent Reviews
Barrels are supposed to be good quality... but by Riacu, Verified Owner, December 12, 2025
Last 2 I got from Opticsplanet had issues with pitting and one with a sizeable dent/chip from the barrel extension. Wondering what is up with all the sudden QC issues from OP or ranier. One shipped with no cover over the barrel extension with resulte...
Read More...
Read All 2 Reviews
Color:
Silver
Finish:
Polished
Caliber:
6.5mm Creedmoor
Barrel Length:
26 in
Barrel Profile:
M4
Gas System Length:
Rifle +2 Length
Gas Block Journal Size-Diameter:
.875 in
Barrel Twist Rate:
1-8
Flutes:
Yes
Gun Make:
AR Platform
Gun Model:
AR-10
Condition:
New
Firearms Threads Per Inch:
5/8x24

Code: 4ZM-ATB-CPO36-RAB-UM2-65CM-26-R2-FF-POL

MPN: RAB-UM2-65CM-26-R2-FF-POL

UPC: 744985351817

List: $549.95Save $20.00
$529.95

Product Info for Rainier Arms AR Ultramatch MOD2 6.5 Creedmoor Barrel

Introducing their MOD2 UltraMatch CM 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 6.5 Creedmoor Barrel:

Manufacturer: Rainier Arms
Color: Silver
Finish: Polished
Fabric/Material: Stainless Steel
Caliber: 6.5mm Creedmoor
Barrel Length: 26 in
Barrel Profile: M4
Gas System Length: Rifle +2 Length
Gas Block Journal Size-Diameter: .875 in
Barrel Twist Rate: 1-8
Flutes: Yes
Gun Make: AR Platform
Gun Model: AR-10
Condition: New
Firearms Threads Per Inch: 5/8x24

Package Contents:

  • Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel

What firearm models does the manufacturer say Rainier Arms AR Ultramatch MOD2 6.5 Creedmoor Barrel is compatible with?

The manufacturer says that Rainier Arms AR Ultramatch MOD2 6.5 Creedmoor Barrel is compatible with AR-10

Rainier Arms AR Ultramatch MOD2 6.5 Creedmoor Barrel Orderable Models

List of Orderable Models

  • Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-POL , MPN: RAB-UM2-65CM-26-R2-FF-POL , UPC: 744985351817 , Code: 4ZM-ATB-CPO36-RAB-UM2-65CM-26-R2-FF-POL

Rainier Arms AR Ultramatch MOD2 6.5 Creedmoor Barrel Unavailable & Discontinued Models

List of Unorderable Models

  • Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 22in Satin, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-22-R2-FF-SAT , MPN: RAB-UM2-65CM-22-R2-FF-SAT , UPC: 744985351800 , Code: 4ZM-ATB-CPO36-RAB-UM2-65CM-22-R2-FF-SAT
  • Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 18in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-18-R-FF-POL , MPN: RAB-UM2-65CM-18-R-FF-POL , UPC: 744985351770 , Code: 4ZM-ATB-CPO36-RAB-UM2-65CM-18-R-FF-POL
  • Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 22in Polished, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-22-R2-FF-POL , MPN: RAB-UM2-65CM-22-R2-FF-POL , UPC: 744985351909 , Code: 4ZM-ATB-CPO36-RAB-UM2-65CM-22-R2-FF-POL
  • Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 18in Satin, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-18-R-FF-SAT , MPN: RAB-UM2-65CM-18-R-FF-SAT , UPC: 744985351787 , Code: 4ZM-ATB-CPO36-RAB-UM2-65CM-18-R-FF-SAT
  • Rainier Arms Ultramatch MOD2 6.5 Creedmoor Barrel, 26in Satin, 1-8 Twist, 5/8x24, Silver, Medium, RAB-UM2-65CM-26-R2-FF-SAT , MPN: RAB-UM2-65CM-26-R2-FF-SAT , UPC: 744985351824 , Code: 4ZM-ATB-CPO36-RAB-UM2-65CM-26-R2-FF-SAT
Compare (0)
1 item has been added
Add at least two items to compare