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5.5" 9mm Top End (Complete Kit)


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Product Features

Our Full Top End Kits include everything you need to convert a Mil Spec AR-15 type rifle into a 9mm carbine. Only the best products in the industry have been selected for these kits.  These top ends were designed and tested using a MIL SPEC lower receiver with a Hahn 9mm Magazine Adapter and a Standard Hammer. Due to differences between manufacturers, we cannot  guarantee  they  will  work  on every lower receiver. Also available as a Top End only. Top End Only models do not include bolt buffer, Magazine block, or Magazine.

The use of this topend on an AR Pistol is legal, but the use of this topend on any AR15 rifle/carbine will qualify the firearm as an SBR and the firearm needs to be registered as such.


  • Forward Assist Installed
  • "T"Marked Upper Receiver
  • Hahn Precision Magazine Adapter (YHM-920)
  • Metalform 32 Round 9mm Magazine (MAG-9MM32)
  • YHM Extended, Heavyweight Buffer (YHM-925-A)
  • CMMG Ramped 9mm Bolt Carrier Assembly (YHM-921-A)
  • Forged 7075-T6 Aluminum YHM Flat Top Upper Receiver
  • Chambered in 9X19mm, with a 1:14” twist, 6 groove
  • YHM 9mm 5C2 Flash Hider / Compensator (YHM-80-5C2)
  • 5.5" 4140 Steel Barrel, Heat Treated to RC 25-32, Threaded 1/2”-36

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