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Precision Reflex
Precision Reflex MK12 Mod 0 SPR GEN II 5.56MM 18'' Barrel 1-7 Twist Upper Black
$2,229.99 -
Precision Reflex
Precision Reflex MK12 Mod 0 SPR GEN II 5.56MM 18'' Barrel 1-7 Twist Upper FDE
$2,109.99 -
Precision Reflex
Precision Reflex MK12 Mod 0 SPR GEN II 5.56MM 18'' Barrel 1-8 Twist Upper Black
$2,089.99 -
Precision Reflex
Precision Reflex MK12 Mod 0 SPR GEN II 5.56MM 18'' Barrel 1-8 Twist Upper FDE
$2,109.99 -
Precision Reflex
Precision Reflex MK12 Mod-h .223/5.56 NATO Complete Upper Receiver for AR-15 - MK12 Mod-h .223/5.56 16''
$1,899.99 -
Primary Weapons Systems
Primary Weapon Systems MK107 Mod 2-M Upper 7.62X39 7.75 CQB30
MSRP: $1,349.95$1,299.95 -
Primary Weapons Systems
Primary Weapon Systems MK111 Mod 1-M Upper 338ARC 11.85 Ls Frc
MSRP: $1,299.95$1,259.99 -
Primary Weapons Systems
Primary Weapon Systems MK111 Mod 1-M Upper 7.62X39 11.85 Ls Frc
MSRP: $1,299.95$1,259.99 -
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Primary Weapons Systems
Primary Weapon Systems MK111 Mod 2-M Upper 7.62X39 11.85 Frc Compensator
$1,529.99 -
Primary Weapons Systems
Primary Weapon Systems MK114 Mod 1-M Upper 6MM Arc 14.5 Ls Frc Com
MSRP: $1,299.95$1,259.99 -
Primary Weapons Systems
Primary Weapon Systems MK116 Mod 1-M Upper 338ARC 16.1 Ls Frc
MSRP: $1,209.95$1,049.95 -
Primary Weapons Systems
Primary Weapon Systems MK116 Mod 2-M Upper 338ARC 16.1 Ls Frc Compensator
$1,529.99
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.