Bravo Company AR-15 Barrel 18" 5.56 NATO 1:8 Rifle Length Mk12 SPR Profile

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If you are in the market for a MK12 style rifle but would rather build it yourself, check out this Bravo Company USA SPR profile AR-15 barrel. It comes with all the features you expect from a BCM barrel like hand lapped button rifling, M4 feed ramps, and made out of high quality materials. While 416 stainless steel has its benefits, BCM chose to machine this barrel out of 410 stainless steel because of its higher corrosion resistant properties and overall hardness. Like most stainless steel barrels, it utilizes a medium or SPR profile that enhances accuracy by decreasing barrel vibration. The 1:8 twist is optimal for shooting heavier ammo out to long ranges and paired with the 18” barrel, you will be hitting shots with ease. This 5.56 barrel has a rifle length gas system for optimal reliability and features a dimpled .750” gas block shelf for a rock solid fitment. Possibly the coolest feature of this MK12 barrel is the extended gas block shelf which is designed to be used with the Ops Inc. 12 suppressor. With the proper collar and muzzle brake installed, it provides a tight gas seal that aids in suppression. Grab this BCM 18” SS410 barrel and get started on your MK12 build today.

  • 18” 410 stainless steel barrel with rifle length gas system
  • 1:8 twist rate for stabilizing heavy bullets
  • 5.56 NATO match chamber
  • SPR barrel profile
  • Extended .750” gas block shelf for use with Ops Inc. 12 suppressor
  • Button rifled and hand lapped

Expect nothing less than professional grade weaponry from Bravo Company Manufacturing, one of the nation’s largest stocking inventories of AR-15, M4, and M16 parts and accessories. Their products have been used by many United States law enforcement agencies, US Border Patrol, HQ SOCOM, US Army, US Navy, US Airforce, US Marines, US Coast Guard, and more. They believe in providing responsible citizens with the means to defend themselves and will continue to do so for many years to come.
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Barrel CoatingStainless Steel
Barrel ContourSPR
Barrel Length18
Barrel LiningStainless Steel
Barrel Material410 Stainless Steel
BrandBravo Company Manufacturing
Caliber Gauge5.56 NATO
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthRifle
Thread Pattern1/2 X 28
Twist Rate1:8
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

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Another high quality BCM product

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This barrel is of very high quality. Would highly recommended. Other manufacturers offer this style of barrel for less cost but are no where near the barrel this BCM is. Fit and finish are excellent. Ships in very good packaging that leaves no chance for damage. Thanks Primary arms for offering a great product!