Cross Machine Tool 10.5" 300 BLK 1:7 Carbine Length Complete Upper

Manufactured by Cross Machine Tool
SKU: 300-UPR-10
MPN: 300-UPR-10
Manufactured by Cross Machine Tool
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NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.



NOTE: This upper assembly has a barrel less than 16” in length. These uppers are intended for use in AR pistol or legal short-barreled rifle builds. Other configurations may violate Federal law.

Cross Machine Tool Co., utilizing the latest machining technologies, offers high quality products that you’ll be excited to own.

The CMT 10.5" 300 BLK Complete Upper Receiver offers reliability and durability in a compact package. Crafted from the highest quality components, this upper is assembled by Veteran armorers, head spaced and test fired to ensure proper function.

Featuring a full-length Picatinny top rail to provide space for forward mounted lights, NV/IR optics, or laser designators. M-LOK slots at the 3, 6, and 9 o'clock positions offer plenty of room for further expansion.

  • 10.5” 41V50 chrome moly vanadium steel barrel
  • Chrome lined with a salt bath nitride finish
  • Chambered in 300 AAC Blackout with a 1:7 twist rate
  • Carbine length gas system
  • CMT UHPR 9.5” HDX M-LOK Rail
  • CMT CFC ZCOMP muzzle device
  • CMT Nitrided M16 BCG
  • CMT Charging handle
  • CMT Low profile gas block pinned to barrel
  • 5-axis machined 7075-T6 billet upper receiver
  • 6000 series extruded aluminum rail
  • QD sling sockets
  • Inside diameter: 1.315”
  • Made in the U.S.A.
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Barrel ContourMedium
Barrel Length10.5
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandCross Machine Tool
Caliber Gauge300 Blackout
Gas System LengthCarbine
Gas System TypeDirect Impingement
Handguard10 in M-LOK Rail
Muzzle DeviceMuzzle Brake
Twist Rate1:7
Weight3.56 lbs

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

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