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Aero Precision
Aero Precision M4E1 16" Carbine-Length /Atlas R ONE handguard CALIFORNIA LEGAL - .223/5.56
$649.99 -
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Palmetto State Armory
Palmetto State Armory Gen4 Lightweight Complete Upper CALIFORNIA LEGAL - 9mm
+ 2 reviews
$499.99 -
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Colt's Manufacturing Co.
PSA Complete M4 Upper W/MBUS REAR CALIFORNIA LEGAL - .223/5.56 - FDE
$499.99 -
Palmetto State Armory
Palmetto State Armory Rifle Kit M4 Carbine Classic CALIFORNIA LEGAL - .223/5.56
$549.99 -
Palmetto State Armory
Palmetto State Armory Rifle Kit 16" Mid-Length CALIFORNIA LEGAL - .223/5.56
MSRP: $729.99$649.99 -
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Palmetto State Armory
Palmetto State Armory Rifle Kit 16" Mid-Length Magpul MOE/EPT CALIFORNIA LEGAL - .223/5.56
MSRP: $729.99$649.99 -
Palmetto State Armory
PSA Rifle Kit 16in Mid Length Magpul MOE CALIFORNIA LEGAL - .223/5.56
MSRP: $799.99$499.99 -
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Palmetto State Armory
PSA Rifle Kit 16in/Carbine Lightweight Magpul MOE/EPT CALIFORNIA LEGAL - 5.56
MSRP: $729.99$689.99 -
Palmetto State Armory
PSA Rifle Kit 16in/MidLength Lightweight Magpul MOE/EPT CALIFORNIA LEGAL - 5.56
MSRP: $729.99$689.99 -
Palmetto State Armory
PSA 16" Midlength 5.56 NATO 1:7 Nitride MOE Freedom Rifle Kit CALIFORNIA LEGAL - .223/5.56
MSRP: $729.99$449.99 -
Palmetto State Armory
PSA Rifle Kit 16in/MidLength Magpul MOE CALIFORNIA LEGAL - 5.56
+ 2 reviews
MSRP: $729.99$709.99 -
Spike's Tactical
Spike's Tactical ST-15 LE Carbine Complete Upper 16" CALIFORNIA LEGAL - .223/5.56
MSRP: $859.99$839.99 -
Spike's Tactical
Spike's Tactical Spartan Lower/Upper Set Bronze CALIFORNIA LEGAL - .223/5.56
MSRP: $974.95$879.99 -
Spike's Tactical
Spike's Tactical Flat Top Upper w/ Ejection Port Door CALIFORNIA LEGAL - 9mm
MSRP: $115.00$104.99 -
Spike's Tactical
Spike's Tactical M4 Flat Top Upper CALIFORNIA LEGAL - .223/5.56
MSRP: $115.00$104.99
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.