Sentinel Arms Mfg™ Custom AR Barrels - EXmatch™ AR-15/M-16 Barrels

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Sub-MOA Guarantee:
3 round group, 1 inch or less, at 100 yards with quality match ammunition and proper shooting techniques. Bolt must be headspaced to the barrel (16" or longer) by Sentinel Arms Mfg™.*
Current Lead Time:
8 to 10 Weeks**
Additional Lead Time(s):
Fluting adds 1 additional week(s); Cerakote adds 1 additional week(s); Cryogenic barrel stress relief adds 2 to 3 additional week(s)**
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Sentinel Arms Mfg™ Custom AR Barrels - EXmatch™ AR-15/M-16 Barrels

Order a custom EXmatch™ (Extreme Match) AR-15 / M-16 pattern barrel with barrel extension. These are custom made to order, extreme match grade barrels. Our barrels are precision pull-button rifled, hand lapped, and inspected with a bore scope for imperfections. They are made to our exact specifications with quality US materials to ensure reliability and accuracy. They are 100% made in the USA. These are reliable, durable and extremely accurate barrels. All EXmatch™ barrels come with a sub-MOA guarantee*. These are the highest quality barrels we offer.

Our AR barrels are tested with milspec buffer tubes and springs. Any changes could change the way your AR functions.

All AR barrels are headspaced, by default, to JP Enterprises bolts.

Gas Block Length

All custom EXmatch™ AR pattern barrels come with a 1.92" gas block length except our ultra light weight and light weight contours which comes with a 1.00" gas block length. Some shorter barrel and gas system length combinations with will also require a 1.00" gas block shoulder length instead of the usual 1.92" to make enough room for engraving our production stamp at the top of the barrel.

Cryogenic Barrel Stress Relief (Cryo)

We also offer cryogenic barrel stress relief (cryo) on barrels. What is cryo? Cryo is a computer controlled scientific dry cryogenic tempering process which relieves stress in firearm barrels. When we cryo a barrel, it is brought down in temperature to -300°F for 24 hours, utilizing dry nitrogen technology, and slowly brought back up to increasingly higher temperatures in controlled increments. By the time the process is complete, which takes 72 hours, the barrel has undergone a 600°F tempering cycle with both hot and cold elements. This allows the material stresses from machining to be relieved which results in a more solid platform with significantly less movement and whipping when the barrel heats up from use. What are the benefits of cryo? With a cryo'ed barrel, the shooter will see a 50 to 60 FPS increase at the muzzle, less fouling, easier cleaning, up to 50% tighter and more accurate groups, DOUBLE the barrel life, and up to 30% lower core temperature. This is a permanent improvement to your barrel. If you are looking for the ultimate in accuracy and durability, cryo is your best option.

Barrel Break-In Procedure

Click here for complete EXmatch™ barrel break in procedures.

Barrel Contours

Click here for complete EXmatch™ barrel contours.

Tech Reference

Click here for EXmatch™ tech information.

Please Note: Read First Before Ordering a .224 Valkyrie or .22 Nosler Chambered Barrel

On our custom AR barrel drop-down menu stipulations, regarding the .224 Valkyrie and .22 Nosler chambering options, we have a note to the side of them shown as "No 1/2" x 28 Threads". We do this because with the types of high pressures and extreme heat generated by those rounds, and the concentration of both in such a small bore diameter, in some cases there isn't enough structural wall thickness at the crown with 1/2" x 28 muzzle threads, and we've seen it quite often "bell out" after shooting a few rounds, noticeably reducing accuracy. Our machinists and technicians put a lot into ensuring our barrels are extremely accurate, and we want them to maintain their accuracy potential for as long as possible.

Please ensure that if you're ordering a .224 Valkyrie or .22 Nosler barrel, and plan on having a threaded muzzle, that you select at least 5/8" x 24 muzzle threads and not 1/2" x 28 muzzle threads.

* Sub-MOA guarantee is a 3 round group, 1 inch or less, at 100 yards with quality match ammunition and proper shooting techniques. Bolt must be headspaced to the barrel (16" or longer) by Sentinel Arms Mfg™ in AR type barrels.

** Lead times are the best estimates, but can sometimes be longer than expected

14 Reviews Hide Reviews Show Reviews

  • 5
    This makes 3

    Posted by LD

    This is my 3rd barrel. I'm not buying from anywhere else. Perfect. I will be BACK.

  • 5

    Posted by SL

    Just wanted to update you on your barrel!! Wow. That’s all I’m going to say! Thanks again. I manage to get a coyote at 150 yrds with it and recorded it. I Will order through you guys again!!

  • 5
    i love this thing!

    Posted by PF

    I love this barrel. I will say it does cost a little more than some others out there, but you pay for quality right? well worth it. can't wait to get another one for my next build. thanks guys.

  • 5
    Color me impressed...

    Posted by RB

    I recently purchased one of your Sentinel Arms USA barrels in .223 Wylde 1-8 twist...The barrel shot true right from the outset with the can on, or off. It shot a zero group of 0.767" at 100 yards using Lapua 55 grain FMJ match ammunition...I was greatly impressed with this barrel's ability to shoot such a light weight bullet in a 1-8 twist when I intended to load 69 through 77 grain OTM bullets to which this barrel is better suited. Color me impressed...

  • 5
    Change of plans!

    Posted by TS

    Change of plans!!! This SS barrel is way too NICE to hide under a handguard!! I will guarantee any of you, that if you do your part Sentinel Arms USA barrels will deliver and exceed every expectation that you could imagine.

  • 5
    Thank you so much

    Posted by SA

    Thanks for the personal touch. I appreciate it...I will send a picture of my build when it is done and sing your praise to anybody who will listen...Thanks again...

  • 5

    Posted by MS

    Very fast shipping. Very good looking barrel with 11 deg crown. A+ VERY pleased.

  • 5

    Posted by JC

    Beautiful barrel, nicely machined. Thanks.

  • 5
    This is 2

    Posted by DW

    Awesome barrel. This is 2. Will buy from again without question.