SI Defense Barrel AR-15 300 Fireball (7.62x35mm) 16" M4 Contour 1 in 8" Twist Matte

Product #: 677048 SI Defense #: SI AR-15-B-M4-300BLK-16
$199.99

Please Sign In to use this feature.

Product Information

SI Defense AR-15 Barrels are made from 4140 chrome moly steel and use button rifling. The barrel is chambered in 300 AAC Blackout with a 1 in 8" Twist. The M4 profile is light under the handguard and .750" at the gas block with the M203 cut. The muzzle is Threaded 5/8"-24 to accept muzzle brakes, flash hiders, or a sound suppressor. The barrel is finished with a mil-spec manganese phosphate finish and includes a pre-installed barrel extension and locator pin.

The 300 AAC Blackout (7.62x35mm) squeezes 30 caliber firepower into the traditional AR-15 envelope, and is available in either subsonic or supersonic ammunition varieties to serve a multitude of purposes. All that is needed to harness the enhanced performance of the 300 Blackout is a simple barrel swap; the bolt, carrier, magazine and all other components remain the same as those used in a traditional 223 Rem/5.56 NATO rifle.

Technical Information:
  • Length: 16"
  • Material: 4140 Chrome Moly Steel
  • Contour: M4
  • Chamber: 300 AAC Blackout (7.62x35mm)
  • Twist Rate: 1 in 8"
  • Chrome Lined: No
  • Finish: Mil-Spec Heavy Phosphate
  • M4 Feed Ramps: Yes
  • Muzzle Thread Pattern: 5/8"-24
  • Gas Port Location: Carbine
  • Exterior Diameter at Gas Port: 0.750"
  • Gas port comes set for supersonic ammunition. It may need to be enlarged to fire subsonic ammunition.

Was this information helpful? Yes No

Thank you for your opinion. We appreciate your input!

Please Help Us Improve

Please enter the missing required fields:

    Please describe why the information was not helpful.

    *Indicates a required field

    Know someone who may like this? Email this Page to a Friend

    Customer Reviews

    The statements and opinions expressed within Customer Reviews reflect each author's personal perspective and do not imply endorsement by MidwayUSA, its Employees or any other organization. Customers should in no way infer that MidwayUSA has validated review information as safe, accurate or appropriate.

    NOTE: Prices, specifications and availability are subject to change without notice.
    We reserve the right to correct typographic, photographic and/or descriptive errors.
    Recently Added
    Suggested Products