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Rainier Arms, LLC

Rainier Arms UltraMatch .223 Wylde Rifle (SPR) Barrel - 18

Rainier Arms UltraMatch .223 Wylde Rifle (SPR) 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. Features:

  • Stainless Steel Match Grade Shilen Blank
  • Length: 18" SPR
  • Twist: 1:8
  • Thread Pitch: 1/2 X 28
  • .750 Gas Block Seat
  • .223 Wylde Chamber
  • Rifle Gas System
  • Ratchet Rifling
  • M4 Feed Ramps
  • SPR 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

Manufacturer Rainier Arms, LLC
Finish Stainless Steel
Barrel Length 18"
Caliber .223 Wylde
Configuration No
Option No
Gas Length Rifle
Height No
Rail Length No
Mount No
Profile SPR
Reticle No
Co Witness No
Size No


Customer Reviews (9)

No commentReview by Brant
After building a SPR type rifle during the "scare", I could only purchase cheap lower end "match" barrels. I have been through 5 cheaper barrels on this rifle and have not been happy with the accuracy at all. Finally I called the guys at Rainer, who were super nice and helpful, and I bought the ultramatch and match BCG. This barrel is great, load development was a breeze and I found a great load using 77gr TMKs, 77 gr Nosler CC (duplicate of mk262 velocity), and 53 gr vmax. Shooting well under 1 MOA even to 700 yds. Save yourself time, money, and especially frustration and just buy this barrel to start. Mk262 duplicate load in a DD mk12 was 2680 fps, out of the Rainer UM the same load is 2760 fps. This barrel is fast and accurate. Thank you guys, look forward to maybe building an AR-10 in Creed using one of these.... (Posted on 9/16/2016)
Short throat!!! BEWARE!!!!Review by Baldy
Ive had this barrel a little under a year. Up until now I've been shooting 69 grains through it and it performed wonderfully. The other day I decided to try some Hornady 75gr match factory ammo - popped primers, stuck cases, FTEs, and a really bad range day. Thought it was the ammo, so I tried it in my other ARs - no issues. I broke out the calipers and the Hornady OAL guage. Turns out the ammo was engraved into the lands about .015" - apparently causing an overpressure situation. Good thing I didn't try to shoot 77s. Glad I didn't blow my rifle up or kill myself, but they really should tell you that this barrel is not throated for the longer pills. I could also be that I got a bad one and the rest are fine. I thought about asking Rainier to fix it but they'll probably just tell me to send it in an my expense and then I'll have to wait for several months to get it back... Or just tell me no. Barrel up for sale. No thanks. (Posted on 8/28/2016)
No commentReview by Tony
- (Posted on 8/25/2016)
The SPR barrel Review by Brandon
This is the most accurate barrel I've ever used in an ar15 platform. The first time out I had half inch groups at 100 yards. Anyone trying to build a super accurate SPR should put this barrel at the top of their list. This barrel is quality and I cant wait to see how tight my groups get with time. Furthermore the shipping was very fast and reasonably priced. Great doing business with these guys. (Posted on 8/24/2016)
Best barrel ever!!Review by J
This absolutely the best barrel I have ever used. First time I shot it I was able to produce half-MOA groups at 100 yards with 55grain wolf gold ammo. I didn't even thing that was possible. Needless to say, I love everything about this barrel, and will be purchasing from rainier arms for any future builds. (Posted on 1/10/2016)
Out standing Review by JJLee
This barrel is one of my favorite part of my build. Excellent quality and super accurate. (Posted on 9/29/2015)
Unmatched Customer Service!Review by Corey
This review is of the customer service I experienced with this barrel. I had fit issues with my barrel and comp and during installation both were damaged. I contacted Rainer and they said to ship both of them back. Now I didn't purchase the comp through Rainer but they were willing to check it out to see what they could do. They not only replaced the barrel, but cleaned up the the threads on the comp and fit checked them before shipping everything back. All it cost me was the return shipping and time. This makes the second ultramatch barrel I have and I could not be more satisfied with their performance! Quality service and quality barrel! (Posted on 8/31/2015)
BUY ONE Review by William
After barrel break in process, first 5 shot group @ 100 yards did .440"... (Posted on 5/9/2015)
Great BarrelReview by John
I'm not usually one to post a review, but I feel inclined to after the results I've experienced. I've had experience with different barrels from different manufacturers and can say this one out performs them all. Even high end off the shelf ARs and bolt actions. I regularly experience half inch groups at 100 yards with factory ammo. Match grade hand loads were even better. Even cheap FMJ's are MOA or better. Save a couple bucks and buy this instead of a Noveske. I did and have no regrets. Now on to the .308 version. (Posted on 2/10/2015)

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