MA 8" .300 AAC Duty Grade Barrel

Your Price: $159.95
Out of Stock.
Part Number:MA-8-300-BO

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Gas Block/Tube

Modern Armory Duty Grade Barrels are 100% USA Made and are individually inspected to ensure it meets its required specifications. They are manufactured from 4150 Chrome-moly vanadium steel and finished with a Nitride finish for extra durability. 

ALL MA Barrels come with a Lifetime Guarantee to be free from manufacture defects.

  • 8" Standard Profile
  • .300 AAC
  • 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)
  • 1:7 Twist Rate
  • QPQ Nitride Finish
  • QPQ Nitride Coated/ Mil-Spec 86L20 case hardened M4 Polished Feed Ramp Extension
  • 5/8 - 24 Threaded Muzzle
  • Pistol Gas System
  • Gas port .093" diameter
  • .750 Gas Block System
  • Dimpled for Gas Block Set Screw.
  • High Pressure Tested (HPT)
  • Magnetic Particle Inspected (MPI)
  • Weights 19oz

*Lifetime Guarantee covers manufacturing defects in materials and workmanship, regardless of the age of the product, but it does not cover normal wear and tear. Wear and tear is damage that naturally and inevitably occurs as a result of normal use.

The use of reloaded or remanufactured ammunition will void the warranty, due to the unpredictability of the standards (SAMMI/NATO) adhered to, since reloads of poor quality ammunition may not meet (SAMMI/NATO) specifications, may exceed limits, and therefore may be unsafe.

ITAR: International Traffic in Arms Regulations Controlled Product

5 Stars
Excellent barrel
Very good quality barrel, comes pre-dimpled, everything looks great
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Reviewed by:  from Ellendale, DE. on 12/13/2021
5 Stars
FFL Owner / AR15 Builder
Purchased for a 300 BO build and I've got no issues. The gas port is properly sized, and paired with a KVP linear comp like the uppers MA sells, the 300 BO is a fun cartridge to shoot in its current pistol form. If you need a barrel, look no further.
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Reviewed by:  from Howe. on 2/26/2020

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