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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

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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

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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

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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]
Upper Bounce Inc. UBESOS7. 56 Upper Bounce 6 Pole Trampoline Enclosure Set to fit 7. 5 FT. Trampoline Frames with set of 3

Upper Bounce Inc. UBESOS7. 56 Upper Bounce 6 Pole Trampoline Enclosure Set to fit 7. 5 FT. Trampoline Frames with set of 3

Buy from Walmart US

Trampoline Safety Fail Trampoline Enclosure Set is a must to have to ensure the maximum safety for your kids and their friends! Get this Upper Bounce High Quality Trampoline Safety Enclosure Set so... [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

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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

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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]