CMMG Banshee 300 MkGs 9mm AR Complete Upper - 5"

Manufactured by CMMG
SKU: 99B17D7
MPN: 99B17D7
Manufactured by CMMG
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NOTE: This upper assembly has a barrel less than 16” in length. These uppers are intended for use in AR-15 pistols or legal short-barreled rifles. Other configurations may violate Federal law.

With the CMMG Banshee complete upper, you can now build out the 9mm PCC of your dreams with the highly reliable and soft shooting radial delayed blowback system. Build yourself a compact AR pistol or SBR with the complete 9mm upper with 5” barrel. The 9mm bolt is designed for compatibility with Glock magazines. The bolt resembles an AR-15 pattern BCG with special cuts on the locking lugs that delay the bolt from unlocking improving reliability. Additionally, it allows the whole assembly to be much lighter and reduces the amount of felt recoil. The barrel features a 1/2x28 thread pitch and a salt bath Nitride finish. The upper receiver is forged from 7075-T6 aluminum and the 4” free float handguard features M-LOK attachment slots. The CMMG Banshee 300 Upper Receiver also comes with an ambidextrous charging handle.

  • 5” barrel chambered in 9mm
  • Radial delayed blowback system
  • 1:10 twist rate with a medium tapered profile
  • Machined from 4140 steel with a salt bath Nitride finish
  • 1/2x28 threaded muzzle with thread protector
  • CMMG RML 4” M-LOK handguard
  • Hardcoat anodized black
  • 7075-T6 forged receiver
  • Ambidextrous charging handle

A leading manufacturer of AR-15 rifles, kits, and accessories, CMMG Inc. was established in 2002. Constantly pushing the edge, CMMG strives to develop and improve bringing you a product lineup that is second to none.
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AssemblyComplete Assemblies
Barrel ContourMedium Taper
Barrel Length5.0
Barrel Material4140 Chrome Moly Steel
Caliber Gauge9mm Luger
Gas System LengthBlowback
Gas System TypeRadial Delayed Blowback
Handguard4 in M-LOK Rail
Muzzle DeviceThread Protector
Twist Rate1:10
Weight2lbs 9oz.

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