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Primary Weapons Systems
Primary Weapons Systems MK109, Mod 2-M, Upper Receiver, Fits AR-15, 300 Blackout, 9.75" Barrel, 1:8" Twist
$1,619.99 -
Primary Weapons Systems
Primary Weapons Systems MK111 MOD-1M Upper, Fits AR15, 223 Wylde, 11.85" Barrel, Black Color, Anodized
MSRP: $1,219.99$1,209.95 -
Primary Weapons Systems
Primary Weapons Systems MK114 Mod 1-M, Upper Receiver, 223 Wylde, 14.5" Barrel, No Muzzle Device, Anodized
$1,209.95 -
Primary Weapons Systems
Primary Weapons Systems MK114 Mod 2-M, Upper Receiver, 223 Wylde, 14.5" Barrel, No Muzzle Device, Anodized
$1,619.99 -
Primary Weapons Systems
Primary Weapons Systems MK116 Mod 1-M, Upper Receiver, Fits AR-15, 223 Wylde, 16.1" Barrel, 1:8" Twist, Fsc
$1,129.95 -
Primary Weapons Systems
Primary Weapons Systems MK116 Mod 2-M, Upper Receiver, 762X39, 16.1" Barrel, TRIAD30 Muzzle Device, Anodized
$1,619.99 -
Primary Weapons Systems
Primary Weapons Systems MK116 Mod 2-M, Upper Receiver, Fits AR-15, 223 Wylde, 16.1" Barrel, 1:8" Twist, Fsc
$1,619.99 -
Primary Weapons Systems
Primary Weapons Systems MK214, Upper Receiver, Fits AR10/SR25, 6.5 Creedmoor, 14.5" Pinned (16" Oal), Frc
$1,939.99 -
Primary Weapons Systems
Primary Weapons Systems MK216, Upper Receiver, Fits AR10/SR25, 308 Winchester, 16.1" Barrel, Frc Compensator
$1,939.99 -
Primary Weapons Systems
Primary Weapons Systems MK216, Upper Receiver, Fits AR10/SR25, 308 Winchester, 18" Barrel, Frc Compensator
$1,939.99 -
Primary Weapons Systems
Primary Weapons Systems MMK116 Mod 1-M, Upper Receiver, 762X39, 16.1" Barrel, TRIAD30 Muzzle Device, Anodized
MSRP: $1,299.95$1,259.99 -
Primary Weapons Systems
Primary Weapons Systems No Attributes Available to Load
MSRP: $1,479.99$1,399.95 -
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Palmetto State Armory
PSA PA10 Gen3 Upper Mid Length (16 in) - .308/7.62x51 - With BCG and CH
$629.99 -
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Upper Receivers
While the lower receiver is the foundation of the firearm, the upper receiver houses the components that most largely determine the performance of the rifle: the bolt carrier group and the barrel. Also, you can assemble a variety of upper configurations and use most with the same lower, meaning you only have one serialized firearm capable of shooting a variety of calibers.
Beginning Jan 1, 2026, California bill SB 704 requires all firearm barrels be transferred through a licensed FFL. AB1263 Requires all orders for NON-Barreled accesories be either verified or transferred through a licensed FFL.