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Adams Arms Ar-15/M16 5.56 16 Basic Piston Upper Receivers

Adams Arms Ar-15/M16 5.56 16"" Basic Piston Upper Receivers

Buy from Brownells

Complete Base upper receiver assembly comes ready to install on mil-spec lower receiver to produce a reliable, positive-cycling gas piston gun. Adams Arms proven piston system doesnt vent hot gases and burned powder into the bolt carrier and receiver, so the gun runs cooler, with less fouling and wear on the action, and easier maintenance. Short-stroke piston shaft eliminates concussive gas expansion in the upper receiver for less violent cycling, smoother feeding, and reduced felt recoil. The receiver is forged from 6061 T6 aluminum and features M4 feed ramp cuts and a 13-slot Picatinny-cut... [more info]
Radical Firearms Ar-15 Upper Receiver Assembly 5.56 M4 16 Carbine

Radical Firearms Ar-15 Upper Receiver Assembly 5.56 M4 16"" Carbine

Buy from Brownells

The Radical Firearms M4 16 Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver... [more info]
Radical Firearms Ar-15 Upper Receiver Assembly 5.56 Socom 16 Midlength

Radical Firearms Ar-15 Upper Receiver Assembly 5.56 Socom 16"" Midlength

Buy from Brownells

The Radical Firearms SOCOM Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver... [more info]
Anderson, 5.56 NATO Barrel, 7.5 EXT M4 Upper Receiver, No BCG or Charging Handle

Anderson, 5.56 NATO Barrel, 7.5" EXT M4 Upper Receiver, No BCG or Charging Handle

Buy from The Sportsman's Guide

Anderson, 5.56 NATO Barrel, 7.5 EXT M4 Upper Receiver, No BCG or Charging Handle [more info]
Brownells Ar-15 Complete Upper Receiver Black Keymod 5.56

Brownells Ar-15 Complete Upper Receiver Black Keymod 5.56

Buy from Brownells

This Brownells exclusive Complete AR Upper Receiver is Made in the USA. Chambered in 5.56x45mm NATO and featuring a 16 barrel with a 1:8 twist. The standard A3 13-slot aluminum flat top receiver... [more info]
Brownells Ar-15 Complete Upper Keymod 5.56 W/ 5-Pk 30-Rd Pmag

Brownells Ar-15 Complete Upper Keymod 5.56 W/ 5-Pk 30-Rd Pmag

Buy from Brownells

This Brownells exclusive Complete AR Upper Receiver is Made in the USA. Chambered in 5.56x45mm NATO and featuring a 16 barrel with a 1:8 twist. The standard A3 13-slot aluminum flat top receiver... [more info]
Yankee Hill Machine Co., Inc. Ar-15 5.56 16 Black Diamond Specter Upper Receiver

Yankee Hill Machine Co., Inc. Ar-15 5.56 16"" Black Diamond Specter Upper Receiver

Buy from Brownells

Flattop upper comes with high-end custom features and accessories already installed, ready to snap on the mil-spec lower receiver of your choice. Comes fully assembled with bolt/carrier, charging... [more info]
CMMG Mk4LE 5.56 AR-15 Upper Receiver Group

CMMG Mk4LE 5.56 AR-15 Upper Receiver Group

Buy from Bass Pro Shops

The CMMG Mk4LE 5.56 AR-15 Upper Receiver Group features a 16.1, M4 profile, 4140 chrome-moly steel barrel. A salt bath nitrided finish is applied to the barrel inside and out, along with the front... [more info]
Yankee Hill 110-BILLET Billet Upper Receiver 223 Rem/5.56 NATO, Black

Yankee Hill 110-BILLET Billet Upper Receiver 223 Rem/5.56 NATO, Black

Buy from Walmart US

Yankee Hill 110-BILLET Billet Upper Receiver 223 Rem/5.56 NATO, Black: Type: Caliber: 223 Remington/5.56 NATOSights: None (Optic Ready) Receiver Description: 7075-T6 Aluminum M4Receiver Finish:... [more info]
Alex Pro Firearms 5.56 NATO Complete Upper, 24 Barrel, Target, 15 1/2 T-Mod

Alex Pro Firearms 5.56 NATO Complete Upper, 24" Barrel, Target, 15 1/2" T-Mod

Buy from The Sportsman's Guide

Alex Pro Firearms 5.56 NATO Complete Upper, 24 Barrel, Target, 15 1/2 T-Mod [more info]
Alex Pro Firearms 5.56 NATO Complete Upper, 16 Barrel, Carbine, 12 1/2 T-Mod

Alex Pro Firearms 5.56 NATO Complete Upper, 16" Barrel, Carbine, 12 1/2" T-Mod

Buy from The Sportsman's Guide

Alex Pro Firearms 5.56 NATO Complete Upper, 16 Barrel, Carbine, 12 1/2 T-Mod [more info]
Anderson Carbine AR Upper Receiver, Semi-Automatic, 5.56 NATO / .300 AAC Blackout, 16 Barrel

Anderson Carbine AR Upper Receiver, Semi-Automatic, 5.56 NATO / .300 AAC Blackout, 16" Barrel

Buy from The Sportsman's Guide

Anderson Carbine AR Upper Receiver, Semi-Automatic, 5.56 NATO / .300 AAC Blackout, 16 Barrel [more info]