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Assembled Uppers

What Comes with an Assembled Upper?
Many firearms have one receiver or frame that “receives” all of the other components of the platform. Sporting rifles like AR-15s have two - an upper and a lower receiver.

If you’re completing a home-built rifle, you’ll need to complete an upper from separate parts or invest in an upper parts kit or a complete upper receiver assembly.

Most assembled uppers will come with:
● The upper receiver
● A barrel
● A handguard
● A gas system (gas block and tube)

Some of ours also contain:
● A forward assist
● Ejection port cover
● Charging handle
● A muzzle device

You will also need a bolt carrier group to complete an upper, and some upper assemblies do not come with charging handles, ejection port covers, or forward assists, so read the included parts selection carefully.

What Else Do I Need?
In addition to an assembled upper, you will need a lower receiver and a complete lower parts kit that contains all of the remaining parts and hardware you need to assemble a functioning rifle.

It is important to note that not all parts kits contain the same components. For example, many parts kits do not contain muzzle devices, bolt carrier groups or magazines, so you will need to purchase them separately and ensure that they are compatible with the rifle you are building, as well as with its cartridge. For example, you need to ensure that the mag and barrel you select agree on the cartridge - such as 5.56 NATO or .300 AAC Blackout.

Please also be aware that it is illegal in some jurisdictions to possess or alter an 80% lower receiver. Consult a lawyer before you begin such a project to ensure you are in compliance with all applicable laws and regulations.

Questions? Call Us!
Not sure what parts or tools you will need to complete your rifle in addition to an AR-15 upper receiver or a complete upper assembly? Give us a call at 239-848-6757 and we will help you find what you need.

  • SALE
    MCS 5" 5.56 NATO UPPER ASSEMBLY (BUILT) MCS 5" 5.56 NATO UPPER ASSEMBLY (BUILT)

    5" 5.56 NATO UPPER ASSEMBLY (BUILT)

    Our USA Made Upper assemblie is one of our many options for an AR-15 Assembled Upper receiver. Our specialty is designing custom built upper receiver that only use the best USA Made parts at the best prices.    USA Made 5.56 NATO AR-15 Upper...

    MSRP: $335.99
    Was: $325.99
    Now: $295.99
    Add to Cart
  • MCS USA Made AR15 Complete Upper Receivers with BCG MCS USA Made AR15 Complete Upper Receivers with BCG

    USA Made AR15 Complete Upper Receivers with BCG

    Our USA Made Complete Upper assemblies with BCG is one of our many options for an AR-15 Assembled Upper receiver. Our specialty is designing custom built upper receiver that only use the best USA Made parts at the best prices.    USA Made 5.56...

    MSRP: $400.00 - $415.00
    $360.00 - $365.00
    Choose Options
  • SALE
    MCS 5" 5.56 NATO UPPER ASSEMBLY WITH BCG (BUILT) MCS 5" 5.56 NATO UPPER ASSEMBLY WITH BCG (BUILT)

    5" 5.56 NATO UPPER ASSEMBLY WITH BCG (BUILT)

    Our USA Made Upper assemblie is one of our many options for an AR-15 Assembled Upper receiver. Our specialty is designing custom built upper receiver that only use the best USA Made parts at the best prices.    USA Made 5.56 NATO AR-15 Upper...

    MSRP: $400.99
    Was: $385.99
    Now: $349.99
    Add to Cart
  • SALE
    MCS AR-15 Upper Receiver 7.5" 5.56 NATO MCS AR-15 Upper Receiver 7.5" 5.56 NATO

    AR-15 Upper Receiver 7.5" 5.56 NATO

    Our complete AR15 5.56 upper comes FULLY ASSEMBLED with a 5.56 NATO barrel, capable of shooting both .223 and 5.56. With an Anchor Harvey Upper and an MCS Hand Guard, this will make your next build the ultimate AR. Includes: ANCHOR HARVEY Upper...

    MSRP: $330.99 - $335.99
    $289.99 - $295.99
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  • SALE
    MCS 5" .300 BLACKOUT UNASSEMBLED PISTOL KIT W/LPK

    5" .300 BLACKOUT UNASSEMBLED PISTOL KIT W/LPK

    MCS Unassembled 300bo Pistol Build Kit   The Build Kit Includes: (1) 5" 300 Blackout barrel, 1:8 twist, Micro Gas system,5/8x24 muzzle thread, nitride finish 5.56 upper receiver with M4 feedramps (1) 5.56  Bolt Carrier Group Low profile...

    MSRP: $410.99
    Was: $380.99
    Now: $369.99
    Add to Cart
  • SALE
    MCS AR-15 16" 5.56 NATO UPPER W/O BCG MCS AR-15 16" 5.56 NATO UPPER W/O BCG

    AR-15 16" 5.56 NATO UPPER W/O BCG

    Our complete AR15 5.56 upper comes FULLY ASSEMBLED with a 5.56 NATO barrel, capable of shooting both .223 and 5.56. With an Anchor Harvey Upper and an MCS Hand Guard, this will make your next build the ultimate AR. Includes: ANCHOR HARVEY Upper...

    MSRP: $399.99
    Was: $375.99
    Now: $314.99
    Choose Options
  • SALE
    MCS AR15 Upper Receiver 10.5" .223 5.56 NATO MLOK

    AR15 Upper Receiver 10.5" .223 5.56 NATO MLOK

    Our complete AR15 5.56 upper comes FULLY ASSEMBLED with a 5.56 NATO barrel, capable of shooting both .223 and 5.56. With an Anchor Harvey Upper and an MCS Hand Guard, this will make your next build the ultimate AR. Includes: ANCHOR HARVEY Upper...

    MSRP: $320.99
    Was: $310.99
    Now: $290.99
    Add to Cart
  • SALE
    MCS 5" 7.62X39 COMPLETE UPPER ASSEMBLY WITH BCG (BUILT)

    5" 7.62X39 COMPLETE UPPER ASSEMBLY WITH BCG (BUILT)

    (BUILT) USA Made 5" 7.62x39 COMPLETE UPPER ASSEMBLY Our USA Made Upper assemblie is one of our many options for an AR-15 Assembled Upper receiver. Our specialty is designing custom built upper receiver that only use the best USA Made parts at the best...

    MSRP: $399.99
    Was: $359.99
    Now: $349.99
    Add to Cart
  • MCS 10.5" .308 UPPER ASSEMBLY BU-308-10 MCS 10.5" .308 UPPER ASSEMBLY BU-308-10

    10.5" .308 UPPER ASSEMBLY BU-308-10

    (1)  10.5" Barrel 1:10 Twist/Nitrided (1)  .308 Win. Bolt Carrier Group (1)  10" Slim Mlok Free Float Hand Guard (1)  .750 Gas Block (1)  Carbine Length Gas Tube (1) .308 Dust Cover (1)  .308 Mil-Spec Charging Handle Alum...

    MSRP: $475.99
    $425.99
    Add to Cart