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Configure Your Custom AR-15 Barrel

Build a custom AR-15 barrel
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Define Gas Port Specification

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Polish or Matte

(Matte is media blasted only!)

Cryogenics

Colors

If you select this opion, we will NOT engrave the default X-Caliber Logo.

-priority tasking (typically shaves off 20%-50% of lead time--cannot be added after order is placed).

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$372.00
$297.60

We use Mil - Spec parts for testing. If any Non Mil-Spec (Adjustable Gas Block, Heavy Buffer, Reinforced Springs, Light/Heavy BCGS, Piston Systems) parts are used, X-Caliber must be contacted. If not your firearm may not cycle properly.

 

FOR ENGRAVING OPTIONS FOR THIS BARREL, PLEASE CLICK HERE.

All AR Barrels that X-Caliber Manufacture receive the X-Caliber Logo engraving at the top of the barrel just behind the muzzle/threads.  If you do not wish that your barrel receives this logo, please specify using the appropriate dropdown menu option when configuring your barrel.

Our ARs are tested with mil spec buffer tubes and springs. Any changes could change the way your AR functions.  

For any calibers which use a big-bore extension (.350 Legend, .375 SOCOM, .450 Bushmaster, .458 SOCOM, etc.), a standard rifle upper (one without feed-ramp extensions) is strongly recommended.

 

*Please refer to the footer of this page for up-to-date production lead-time estimates..

 

Gas Block Selection

  • max length with .625 Gas Block - 16"
  • max length with .750 Gas Block - 24"
  • max length with .875 Gas Block - 28"
  • max length with .936 Gas Block - 28"

 

Gas Block Journal Length

All X-Caliber AR barrels are made to a 1.92" gas block journal length EXCEPT our Lightweight & Spaghetti contours which have a 1.00" length.  Some shorter barrel and gas system length combinations with will also require a 1" gas block journal length instead of the usual 1.92" to make enough room for engraving our production stamp at the top front of the barrel.  Our gas block journals all receive an indexing dimple on the bottom opposite the gas port.

All barrels receiving Cerakote will have the entirety of the gas block journal masked off, so keep this in mind for either 1" or 1.92" long gas block lengh/journal options.

 

Hand Lapped

 

We only guarantee 1 MOA or less if a Rubber City Armory or JP Ent. bolt is headspaced to the barrel by X-Caliber Barrel & Mfg.

 

No Shipping outside the US

*Please refer to the footer of this page for up-to-date production lead-time estimates.

Fluting: Adds 1 week to order lead time

 

To Engrave This Barrel:  Select all desired options and add this barrel to cart then click here.

 

For your crushwasher needs:

https://tromix.com/product/crush-washer/

or for only 1/2x28 crush washers:

https://www.tacticallink.com/Armageddon-Tactical-Stainless-Steel-Crush-Washer-For-12x28-Threaded-AR15-Barrels.html

https://www.joeboboutfitters.com/Crush-Washer-for-1-2X28-Barrels-p/jb-crushwasher.htm

 

For your gas tube needs:

www.whiteoakarmament.com

 

Need a Muzzle Thread Protector?  Head here!

 

*NOTICE REGARDING 6MM CHAMBERINGS: Some SAAMI 6mm chamberings, such as 6mm ARC, 6mm Creedmoor and 6 PRC, might experience projectiles sticking in the freebore of the chamber's throat if the projectiles are at or exceed maximum-SAAMI projectile diameter specifications of .2433-.2434" (depending on chambering).  It has been noted in some instances that Hornady brand projectiles in 6mm can oftentimes be right at the maximum limit for what SAAMI specifications call for, and while safe to fire assuming the load adheres to SAAMI specifications, may experience projectile-sticking when extracting unfired rounds until the barrel has had 100+ rounds fired through it.

 

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X-Caliber Barrel Break-In

Procedure Guide

 

When breaking in your new X-Caliber Barrel, you should perform appropriate fire and clean cycles to normalize the bore surface. Each fire and clean cycle consists of a certain number of rounds fired (one to five) followed by a cleaning procedure (see below for reference), to be completed a certain number of times (1-25). These vary depending on the type of steel of the barrel, bore/groove diameter, velocity and pressure of any given round, etc. This is to be used as a guide. Since our barrels are hand-lapped, each barrel may break in a little differently. Some barrels may require more or less shots or cycles to break in than what is listed here.

 

416R Stainless Steel: Fire One Round then Clean: Do this 5-10 times. Fire Three Times then Clean: Do this 1 time. Fire Five Times then Clean: Do this 1 time.

4140 Chrome Moly: Fire Once Round then Clean: Do this 5-25 times. Fire Three Times then Clean: Do this 2 times. Fire Five Times then Clean: Do this 1 time.

 

 Example: For a 416R Stainless Steel barrel, you would fire one round, then perform the cleaning steps outlined below a total of five to ten times (shoot 1 round & clean, done 5-10 times) before starting the three shot cycle where you would fire three rounds and then clean as outlined below, then proceed to fire five rounds then clean, completing the break-in procedure.

 

Each Firing Cycle (1 shot, 3 shot or 5 shot) should be followed by cleaning the bore (see steps below for reference):

 

1.)    Using a one-piece, coated cleaning rod with a properly sized bore brush (wet with your favorite non-foaming bore solvent), carefully clean the bore from the chamber end toward the muzzle (3-5 passes is usually sufficient). If you cannot clean from the chamber end, be sure to use a bore-guide so as not to damage the crown or muzzle end of the rifling. Let sit 30-60 seconds before moving on to the next step.

2.)    Push a dry patch down the bore. (2-3 times)

3.)    Put a few of drops of oil on a patch and push that down the bore so as to leave a thin film of oil inside the bore.

4.)    Begin a new cycle: Fire your next round or rounds in your next firing cycle and repeat cleaning as necessary.

  

It is recommended to keep a written tally of your current step within the process so if you get distracted you will know where you left off.

 

We use Mil - Spec parts for testing. If any Non Mil-Spec (Adjustable Gas Block, Heavy Buffer, Reinforced Springs, Light/Heavy BCGS, Piston Systems) parts are used, X-Caliber must be contacted. If not your firearm may not cycle properly.

 

FOR ENGRAVING OPTIONS FOR THIS BARREL, PLEASE CLICK HERE.

All AR Barrels that X-Caliber Manufacture receive the X-Caliber Logo engraving at the top of the barrel just behind the muzzle/threads.  If you do not wish that your barrel receives this logo, please specify using the appropriate dropdown menu option when configuring your barrel.

Our ARs are tested with mil spec buffer tubes and springs. Any changes could change the way your AR functions.  

For any calibers which use a big-bore extension (.350 Legend, .375 SOCOM, .450 Bushmaster, .458 SOCOM, etc.), a standard rifle upper (one without feed-ramp extensions) is strongly recommended.

 

*Please refer to the footer of this page for up-to-date production lead-time estimates..

 

Gas Block Selection

  • max length with .625 Gas Block - 16"
  • max length with .750 Gas Block - 24"
  • max length with .875 Gas Block - 28"
  • max length with .936 Gas Block - 28"

 

Gas Block Journal Length

All X-Caliber AR barrels are made to a 1.92" gas block journal length EXCEPT our Lightweight & Spaghetti contours which have a 1.00" length.  Some shorter barrel and gas system length combinations with will also require a 1" gas block journal length instead of the usual 1.92" to make enough room for engraving our production stamp at the top front of the barrel.  Our gas block journals all receive an indexing dimple on the bottom opposite the gas port.

All barrels receiving Cerakote will have the entirety of the gas block journal masked off, so keep this in mind for either 1" or 1.92" long gas block lengh/journal options.

 

Hand Lapped

 

We only guarantee 1 MOA or less if a Rubber City Armory or JP Ent. bolt is headspaced to the barrel by X-Caliber Barrel & Mfg.

 

No Shipping outside the US

*Please refer to the footer of this page for up-to-date production lead-time estimates.

Fluting: Adds 1 week to order lead time

 

To Engrave This Barrel:  Select all desired options and add this barrel to cart then click here.

 

For your crushwasher needs:

https://tromix.com/product/crush-washer/

or for only 1/2x28 crush washers:

https://www.tacticallink.com/Armageddon-Tactical-Stainless-Steel-Crush-Washer-For-12x28-Threaded-AR15-Barrels.html

https://www.joeboboutfitters.com/Crush-Washer-for-1-2X28-Barrels-p/jb-crushwasher.htm

 

For your gas tube needs:

www.whiteoakarmament.com

 

Need a Muzzle Thread Protector?  Head here!

 

*NOTICE REGARDING 6MM CHAMBERINGS: Some SAAMI 6mm chamberings, such as 6mm ARC, 6mm Creedmoor and 6 PRC, might experience projectiles sticking in the freebore of the chamber's throat if the projectiles are at or exceed maximum-SAAMI projectile diameter specifications of .2433-.2434" (depending on chambering).  It has been noted in some instances that Hornady brand projectiles in 6mm can oftentimes be right at the maximum limit for what SAAMI specifications call for, and while safe to fire assuming the load adheres to SAAMI specifications, may experience projectile-sticking when extracting unfired rounds until the barrel has had 100+ rounds fired through it.

 

***************************

 

X-Caliber Barrel Break-In

Procedure Guide

 

When breaking in your new X-Caliber Barrel, you should perform appropriate fire and clean cycles to normalize the bore surface. Each fire and clean cycle consists of a certain number of rounds fired (one to five) followed by a cleaning procedure (see below for reference), to be completed a certain number of times (1-25). These vary depending on the type of steel of the barrel, bore/groove diameter, velocity and pressure of any given round, etc. This is to be used as a guide. Since our barrels are hand-lapped, each barrel may break in a little differently. Some barrels may require more or less shots or cycles to break in than what is listed here.

 

416R Stainless Steel: Fire One Round then Clean: Do this 5-10 times. Fire Three Times then Clean: Do this 1 time. Fire Five Times then Clean: Do this 1 time.

4140 Chrome Moly: Fire Once Round then Clean: Do this 5-25 times. Fire Three Times then Clean: Do this 2 times. Fire Five Times then Clean: Do this 1 time.

 

 Example: For a 416R Stainless Steel barrel, you would fire one round, then perform the cleaning steps outlined below a total of five to ten times (shoot 1 round & clean, done 5-10 times) before starting the three shot cycle where you would fire three rounds and then clean as outlined below, then proceed to fire five rounds then clean, completing the break-in procedure.

 

Each Firing Cycle (1 shot, 3 shot or 5 shot) should be followed by cleaning the bore (see steps below for reference):

 

1.)    Using a one-piece, coated cleaning rod with a properly sized bore brush (wet with your favorite non-foaming bore solvent), carefully clean the bore from the chamber end toward the muzzle (3-5 passes is usually sufficient). If you cannot clean from the chamber end, be sure to use a bore-guide so as not to damage the crown or muzzle end of the rifling. Let sit 30-60 seconds before moving on to the next step.

2.)    Push a dry patch down the bore. (2-3 times)

3.)    Put a few of drops of oil on a patch and push that down the bore so as to leave a thin film of oil inside the bore.

4.)    Begin a new cycle: Fire your next round or rounds in your next firing cycle and repeat cleaning as necessary.

  

It is recommended to keep a written tally of your current step within the process so if you get distracted you will know where you left off.

 

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Worth the wait
Took a little longer than expected to receive due to unforeseen circumstances but VERY worth the wait. Customer service was truly outstanding.  Got a Stainless 16" HBAR in .300BLK, Pistol gas, 1-8.  Got it zeroed and am shooting sub MOA at 100yards with 147gr supers.As an apology for the late delivery they included the X-terminator break. Fits well and works well. Will be ordering my Barrels from here for all my future builds. AR-10 in 6.5 creedmore next.
Christopher | 4/30/2017 11:55 AM
Was this review helpful? Yes No (2/0)
Yes... It is worth the wait
I ordered a 12.7 x 42mm in a Chrome-moly, with nitride and cryo treatments.  It took quite some time; almost 5 months for the order to come through.  Upon assembly, the fit and finish are second to none.  The gas block fit (and I purchased a high quality one) was incredible.  Perfect.  I took it out to the range this past weekend for the first time and I was getting consistent groups sub-2".  Considering this barrel is throwing .50 cal/350gr bowling balls down range, that's amazing.  I expect it'll only get better as I spend time with the rifle.  Couldn't be happier.  X-caliber is definitely a top tier barrel manufacturer.  I'll be back for more!
Owen | 10/11/2017 7:37 PM
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6.5 Grendel Type II .136" 20 inch Beauty
Beautiful barrel that shoots amazing.1.7 twist works real well with 140gr Hornady pills out to 600 plus yds. 3/8 Moa at 100 yds and if the shooter was better, its light out. Cant go wrong with X-Caliber. Sandstorm AZ
John | 12/24/2017 1:53 PM
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300 blackout
Bought a 18 inch 1/9 and shot it for first time today. I gotta say I am a xcalibur man from now on!! Mid length they even opened up gas port to work with the mid length stroke and the gun ran flawless. Loaded h110 and cfe blackout with 125 noslers. 5 shots under a nickel and THTS with an ok rest and factory trigger. I am so happy with the quality and all my barrels will be coming from here. After trouble with lothar walther and the customer service and tooling marks left in barrel I have found a barrel maker tht stands behind there products and THTS xcaliber.
Orry | 1/29/2018 5:05 PM
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Pretty Accurate
I have 22 inch 1/7 twist 223 Wylde chamber barrel. SPR contour diamond fluted. I have been shooting it for the last two months. At 200 yards I get 1.8 inch to 0.875 inch 5 shoot groups (0.9 inch to 0.44 inch at 100 yards) regularly. I suspect larger groups are due to my (in)abilities. I wish they have an option to post pictures. I did send them my gas bolt, hence the barrel was matched to it. So far one of the most (if not the most) accurate barrel I have ever owned.
At 600 yards I get 7 inch groups, but with a better shooter I think it can group tighter.
Ilija | 12/29/2020 10:30 AM
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24” 204 Ruger
This was my 2nd X caliber barrel but won’t be the last. Barrel showed up ahead of schedule. Ive had both of my barrels corkscrew fluted and they are both absolutely beautiful. After a good break in I took it to the range and it will shoot a reliable 1/2 moa at 100 yards if I do my part and generally sub moa with most loads. I will be ordering another couple barrels over the next few months and have no doubt they will be superb.
Clark | 5/14/2021 5:41 AM
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