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U.S. Arms M4 UTAW 300 Blackout Rifle


ATF regulated items have restrictions and requirements:

  • Your order will ship only to a Federal Firearms License holder.
  • We are not currently shipping to CA, CT, DC, HI, MD, MA, MN, NJ, NY, or VA.
  • Please be sure to contact your local FFL dealer prior to placing your order to ensure they are still accepting transfers. Some FFL dealers are not open due to Covid-19.
  • Customer must read, understand, and agree to customer terms and conditions.



.300 AAC Blackout

Muzzle Device

Flash Hider


16" medium profile, 1:7 twist, cold hammer forged, chrome lined, nickel boron extension

Muzzle Thread

5 / 8 × 24 threads per inch

Lower Receiver

U.S. Arms standard lower receiver

Mounting System

Picatinny top rail and M-LOK slots


6.3 lbs


33.5" – 39.4"


Two 30-round Lancer L5-AWM Black


The U.S. Arms M4 UTAW rifle series is our entry level option with a multitude of perks and benefits. This weapon system embodies our desire to create a rifle that is lightweight, durable, and accurate without breaking the bank. This series is offered in 5.56 or .300 Blackout chambering.

The heart of the weapon system was designed from the ground up. U.S. Arms Company is proud to hold the tightest tolerances in the market.  The fit between our upper and lower receivers, which are machined in house, is second to none. We are “The Home of the World’s Tightest Receivers,” and that was no small feat to accomplish. The attention to detail and fit brings the shooter a far more accurate and superior rifle than any other weapon system in its class. The M4 UTAW rifle comes equipped with a U.S. Arms nickel boron bolt carrier group that is mated with a nickel boron barrel extension to give consistently smooth and reliable cycling. This paired with a state of the art 4150 chrome moly, cold hammer forged chrome lined barrel, allows the shooter to be confident and consistently accurate. The M4 UTAW also features a free float handguard, ambidextrous charging handle, an Elftmann ELF-SE drop in trigger, and many other reliable light-weight components which can be found below.

The M4 UTAW rifle series is available in multiple colors and finishes:

  • Anodized Black
  • Cerakote Black
  • Cerakote Chocolate Brown
  • Cerakote Gun Metal Gray


Details and Build Materials

  • Receiver Set: 7075-T6 aluminum mated set by U.S. Arms Company
  • Trigger: Elftmann ELF-SE with curved trigger shoe
  • Hand Grip: Original Ergo grip right handed – SUREGRIP
  • Buffer Assembly: Mil-Spec 6 position aluminum buffer tube with H1 buffer with reduced power buffer spring
  • Buttstock: Strike Industries MOD1
  • Bolt Carrier Group: U.S. Arms Nickel Boron coated M16 style, MP Tested with properly staked gas key
  • Charge Handle: Strike Industries Latchless Charging Handle with Ambi-Latch
  • Handguard: 15″ aluminum free-floating with full-length top Picatinny rail, side and bottom M-LOK slots, and side QD mount points
  • Sights: None
  • Barrel: Cold Hammer Forged 4150 chrome moly, 6 groove, 1:7 twist, with chrome lining, manganese phosphate coating, and a nickel boron extension
  • Gas System: Mil-spec phosphate coated .750″ gas block and stainless carbine-length gas tube
  • Muzzle Device: Strike Industries Venom flash hider
  • Magazine: 2 Lancer Systems L5AWM 30 round magazines
  • Case: SKB iSeries 4909-5 single rifle case


Every M4 UTAW rifle that leaves our plant is inspected to assure the highest quality product we can deliver. These rifles are great for the outdoorsman or sports shooting enthusiast. The U.S. Arms M4 UTAW rifle series is the highest quality lightweight, durable, and accurate weapon system in its class and will last a lifetime.


Note: Cerakote items may require up to 2 weeks processing time.

Note: 30 round magazines will NOT be included in shipments to Oregon, Rhode Island, Vermont, or any other jurisdiction where such magazines are prohibited.