Expo Arms Combat Series AR-15 Barreled Upper Receiver - XP1215KM Brake - 10.3"

Manufactured by Expo Arms
SKU: XP-C-556-103-KM
MPN: XP-C-556-103-KM
Manufactured by Expo Arms
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$399.99 $469.99

In Stock

Standard orders will ship out 2 business days if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



The Expo Arms Combat Series Barreled Upper Receiver offers a high-quality option for any build. The heart of this barreled upper is the Expo MIL-SPEC forged upper receiver assembly, upgraded with T-marks for repeatable optic mounting. The 10.3" Combat Series barrel has a chrome lined 5.56 NATO chamber and reliable carbine-length gas system. The 9.5" Combat Series handguard features M-LOK slots on 7 surfaces providing plenty of space for your favorite accessories. Topping off this upper is the Expo Arms/Forward Controls Design Extended Single-Chamber muzzle brake with Keymo suppressor mount to keep your flat and minimize recoil for fast, accurate follow-up shots. The Expo Arms Combat Series Barreled AR-15 Upper Receiver is the perfect choice for your next AR pistol or SBR build.

Note: Due to the Crane-Spec gas port size of .070” this barrel was designed to function both unsuppressed and suppressed with 5.56 NATO pressure ammunition. Unsuppressed use with lower pressure .223 Remington ammunition may not yield the best results regarding function.

  • 7075-T6 forged aluminum MIL-SPEC upper
  • T-Marked
  • 10.3" Combat Series barrel
  • Carbine Gas System
  • Chrome lined bore with phosphate finish
  • 1:7 Twist Rate
  • 9.5" Expo Arms Combat Series M-LOK Handguard
  • Expo Arms/FCD Extended Single Chamber Muzzle Brake with Keymo Mount

Expo Arms offers top-quality MIL-SPEC AR-15 components at rock bottom prices. Made in the U.S.A. and covered by Expo’s Limited Lifetime Warranty against manufacturer defects, material or workmanship problems, and even normal wear and tear.
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AssemblyBarreled Assemblies
Barrel CoatingManganese Phosphate
Barrel ContourSOCOM
Barrel Length10.3
Barrel LiningChrome
Barrel Material4150 Chrome Moly Steel
BrandExpo Arms
Gas System LengthCarbine
Gas System TypeDirect Impingement
Handguard9.5 M-LOK
Muzzle DeviceExpo Arms/FCD Extended Single Chamber Muzzle Brake Keymo Mount
Thread Pattern1/2 X 28
Twist Rate1:7

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