Ballistic Advantage 5.56 NATO 18″ AR 15 Barrel – SPR Rifle Length w/ OPS 12 – Modern Series

SKU: BABL556020M

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AT3™ Low Profile Micro Steel Gas Block - 4 Sizes Available

AT3™ Low Profile Micro Steel Gas Block - .750"


AT3™ AR 15 Gas Tube & Carbine Gas Tube Length

AT3 Stainless Gas Tube with Roll Pins - Rifle Length


Duty-Ready SPR Profile Barrel with Durable Nitride Finish

With an 18 inch barrel for an optimal velocity-to-length ratio, and a heavy profile for repeatable accuracy and rigidity, this Modern series barrel is perfect for your Special Purpose Rifle.  This barrel’s tapered profile means that in spite of the weight, it remains handy and easy to carry, and won’t let you down in the precision department.

This barrel also features an Mk12 Mod H profile, with a longer .750″ profile dimension necessary for proper installation of the OPS Inc. 12th model collar and suppressor for optimum fit and function. It also has a rifle-length gas system, giving you excellent reliability and a soft recoil impulse.

Sub-MOA Guarantee

Buying a Ballistic Advantage barrel means guaranteed accuracy. All Ballistic Advantage barrels are guaranteed to give Sub-Minute-of-Angle (MOA) accuracy with match grade ammunition.


  • Length: 18″
  • Material: 4150 CMV Steel
  • Profile: SPR
  • Finish: QPQ Corrosion Resistant
  • Gas System Length: Rifle
  • Gas Block Journal: .750″
  • Twist Rate: 1:8 inches
  • Muzzle: 1/2×28 Threaded
  • Weight: 41 oz
  • Other Info: HP and MPI Tested


Caliber5.56 NATO/.223 Remington
Barrel Length18 inches
Barrel Twist Rate1:8 inches
Barrel Material4150 CMV
Muzzle Threads1/2/2028
Barrel FinishBlack Nitride
Gas Block Size.750″ Gas Block
Barrel ProfileSPR
Barrel Gas SystemRifle
Gas Block Journal Length1.9 inches
Barrel ExtensionM4
Weight41 ounces

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Ballistic Advantage Warranty!

If for any reason you have a warranty issue with one of our products, please describe your situation, include your name and order number or transaction ID. One of our technical specialists will then review your claim and contact you within 5-7 business days.

PLEASE NOTE: We cannot provide warranty work if your items have been altered by you or anyone other than Ballistic Advantage from their original state.

Please call 407-347-4584 if you have any questions regarding this policy.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 1 review
Thomas Wylam
Awesome purchase

One of the best purchases I've every made. Great barrel.