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AR9 Right-Side Charging Bufferless Upper Assembly - 5" Parkerized M4 Barrel, 1:10 Twist Rate with 4" MLOK Handguard

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The most compact AR upper on the market. Period.

Introducing the AR-15 Complete Bufferless 9mm Pistol-Length Upper Assembly. Crafted to precision, this upper boasts a 5" M4 barrel finished with durable parkerization, featuring a 1:10 twist rate and a reliable blowback gas system.

Includes Sealed, Bufferless End Plate

This bufferless 9mm upper includes a unique, sealed end plate. The plate features a Picatinny rail for attaching a folding stock adapter!

Other Upper Features

Also included is a 4" MLOK rail, and M4 flat-top billet upper receiver. Equipped with a top-tier 9mm bolt carrier group and a flash hider, this upper also showcases the latest Gen 2 Side Charging handle for seamless operation. Designed to seamlessly integrate with mil-spec AR9 80% lowers and retail AR9 lowers, this upper offers unparalleled performance and compatibility.

AR-9 Upper Assembly Specs


  • Chamber: 9mm
  • Contour: M4
  • Length: 5
  • Twist Rate: 1:10
  • Gas System: Blow-back
  • Muzzle Threads: 1/2x36
  • Feed Ramps: Single
  • Material: 4150 CMV
  • Finish: Parkerization
  • Process: Button Rifled
  • Lining: QPQ Nitride
  • Extension: M4
  • Muzzle: Spiral Flash Hider


  • Attachment System: 4" M-Lok
  • Finish: Type III Hardcoat Anodized (Mil-Spec)
  • Top Rail: Split Rail / 1913 / Picatinny Rail
  • Material: 6061-T6 Billet Aluminum
  • Attachment: Barrel Nut

Upper Receiver

  • Profile: A3 Flattop
  • Material: Forged 7075-T6 Aluminum
  • Finish: Type III Hardcoat Anodized (Mil-Spec)

Bolt Carrier Group

  • Profile: 9mm / Blow-back
  • Steel: 9310 Tool, HPT/MPI-tested
  • Exterior: Black Nitride
  • Interior: Parkerized
  • Gas Key: 9mm Blow-back
  • Charging Handle: Included Left-Side Charging

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Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.


We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.