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Rainier Arms, LLC

Rainier Arms UltraMatch .223 Wylde Intermediate Barrel - 18

Rainier Arms UltraMatch .223 Wylde Intermediate Barrel - 18

Availability: In stock




We wanted to build an AR15 barrel using the finest blank and mass produce them to bring them to market at the most competitive prices. Our UltraMatch barrels start out as Shilen blanks and contoured to our specifications. We wanted the best balance between accuracy while keeping the weight down as much as possible. It also features Shilen's Ratchet Rifling which allows for flatter trajectories and easier cleaning. We are so confident in our UltraMatch barrels that we will offer a 100% money back guarantee within 90 days of purchase. If you aren't completely satisfied with the barrel for any reason, return it for a full refund, no questions asked. The Intermediate Gas system is slightly longer is in-between the mid & rifle length gas systems. Intermediate gas tube is needed.


  • Stainless Steel Match Grade Shilen Blank
  • Length: 18" Intermediate
  • Twist: 1:8
  • Thread Pitch: 1/2 X 28
  • .750 Gas Block Seat
  • .223 Wylde Chamber
  • Intermediate Gas System
  • Ratchet Rifling
  • M4 Feed Ramps
  • WOA Contour
  • Bead Blasted Finish
  • Weight: 2 lbs 9 oz

Barrel Care

For your convenience we have published barrel care recommendations for this product. The instructions are in Adobe Acrobat's Portable Document Format (PDF). You will need Adobe Acrobat Reader version 5.0 or higher to view and print the instructions.

If you do not have Adobe's Acrobat Reader, you can download a free copy at

Additional Info

Additional Info

SKU RAB-U-223-I18-SS
Manufacturer Rainier Arms, LLC
Finish Stainless Steel
Barrel Length 18"
Caliber .223 Wylde
Configuration No
Option No
Gas Length Intermediate
Height No
Rail Length No
Mount No
Profile Medium Contour
Reticle No
Co Witness No
Size No


Customer Reviews (4)

Well worth the moneyReview by BMP
I mounted this barrel up as well as a Rainier precision NiB BCG on my SPR/coyote rig. After a slight break in the rifle has shot a best of .408" CTC. That is a 5 shot group at 100 yards using Caldwell bags front and rear and a 1-6X scope. My undeveloped load is unsorted Remington cases, CCI primers, 24 grains of Reloder 15 behind unsorted 75 grain BTHP Hornady bullets. I get consistent hits on my 2/3 IDPA AR500 plates at 500 yards as well. With a good rest it will easily shoot under MOA at this distance. This barrel actually shoots tighter than a 26" bull barrel I had cut from a competitor. The 18" barrelled gun is way more versatile, is easier to point for hunting and weighs half as much. Thanks Rainier for the excellent products! (Posted on 8/27/2016)
18" ultramatch - so far so goodReview by Pete
Purchased the 18" ultramatch intermediate barrel, along with the Rainier gas block and intermediate tube. Mounted it into an Aero Precision M4E1 enhanced upper with matching 12" MLOK handguard (which makes for a very rigid platform and a super easy install). Nice thing about the intermediate gas system is that the gas block tucks nicely under the 12" handguard and doesn't stick out.

Took it out this weekend for the break in procedure. With cheap PRIVI 69 grain sierra matchkings, by the time I got into the 5-shot series, I was getting sub MOA at 100 yards using a 3x scope with a bipod off a shakey plastic table. Confident that with some better ammo like Black HIlls, and a steady bench I should be able to improve upon that and get into the 1/2 MOA level. I'll update my review after my next trip to the range.

From what I have seen so far, I would say this barrel will deliver the goods if I do my part! (Posted on 7/4/2016)
No commentReview by Jason
- (Posted on 6/28/2016)
No commentReview by Jason
- (Posted on 6/28/2016)

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