DSA ZM4 A3 AR15 Upper Receiver

Steve Johnson
by Steve Johnson

DS Arms are now selling half-assembled AR-15 receivers. Half assembled means no bolt, bolt carrier or charging handle.

  • Forged 7075T6 A3 Flattop Upper Receiver
  • Forged Front Sight Base with Bayonet Lug
  • A2 Flash Hider
  • 16 Inch 5.56mm NATO Nitride Treated Chrome Moly 1:9 Twist ZM-4 Barrel
  • M4 Style Handguards
  • Aluminum Delta Ring
  • M4 Style Feed Ramps

The introductory price is $275.

Steve Johnson
Steve Johnson

I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!

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2 of 8 comments
  • Bp Bp on Oct 03, 2009

    Just a heads-up, M4 ramps aren't a feature any more. Units being shipped recently had hand-filed feed ramps and other QC problems widely talked about on ar15.com. I'm happy with mine despite the feed ramp jobs, DSA chimed in and will not be cutting any more feed ramps on new ones.


  • Shawn Shawn on Feb 08, 2010

    The 53 page thread at arfcom reports that this upper will feed cheep and quality ammo flawlessly with a number of bcg's. The actual owners of this this gun that know how to test it report accurate groups. They no longer offer costume machined ramps because people did not realize the value of such upgrades.
    Sincerely Shawn