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 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.
Weight: 1lb 12oz (for 16" long, Mid-length gas, .223 Wylde, AR15 HBAR-Lite contour, 5/8x24 muzzle threads)
6 Carbon Fiber AR-15 HBAR-Lite or HV-Lite Barrel Contours Available:
AR15 HBAR-Lite .980, .750GasBlock, .750 // 1/2"x28 Muzzle Threads
AR15 HBAR-Lite .980, .750GasBlock, .750 // 5/8"x24 Muzzle Threads
AR15 HV-Lite .980, .875GasBlock, .875 // 1/2"x28 Muzzle Threads
AR15 HV-Lite .980, .875GasBlock, .875 // 5/8"x24 Muzzle Threads
AR15 HV-Lite .980, .875GasBlock, .875 // 11/16"x24 Muzzle Threads
AR15 HV-Lite .980, .875GasBlock, .875 // 3/4"x24 Muzzle Threads
Muzzle must be threaded, see muzzle thread options in the barrel configuration dropdown menu.
All Carbon Fiber AR Barrels use 1" long gas block journals and will not fit a gas block that is longer than 1".
49/64x20 Muzzle Threads are NOT AVAILABLE on Carbon Fiber AR Barrels
Carbon Fiber AR15 Barrels Only support .350 Legend or Smaller calibers.
Our ARs are tested with mil spec buffer tubes and springs. Any changes could change the way your AR functions.
Please check our Frequently Asked Questions for our current lead times.
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.
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 max-SAAMI projectile diameter specifications of .2435" (which is the same diameter as SAAMI freebore of the aforementioned chamberings). 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.
