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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 Glock 19 Black - Nitride 9mm Barrel (Made in USA) MCS Glock 19 Black - Nitride 9mm Barrel (Made in USA)

    Glock 19 Black - Nitride 9mm Barrel (Made in USA)

    9MM Drop in fit for Gen 1-4 & Glock Gen 5 Available threaded and non-threaded Polished Feed Ramp Black Nitride Finish 1:16 Twist Rate SAAMI spec. 9mm Match chambers  Machined from 416 stainless steel and heat treated to RC 41   

    MSRP: $120.99
    Was: $110.99
    Now: $75.99
    Add to Cart
  • Armaspec Stealth Recoil Spring 9MM

    Stealth Recoil Spring 9MM

    The Stealth Recoil Spring is a drop-in replacement for the standard buffer and spring. The Stealth Recoil Spring improves the precision of your shots by reducing the felt recoil and it keeps the buffer spring from rubbing against the inner wall of the...

    MSRP: $99.99
    $89.99
    Add to Cart
  • MCS Glock 17 9mm Slide RMR Ready W/ Cover Plate MCS Glock 17 9mm Slide RMR Ready W/ Cover Plate

    Glock 17 9mm Slide RMR Ready W/ Cover Plate

    Gen 3 Compatible Fits Model 17/22/31 frames Accepts Polymer80 frames Machined from 416R Stainless steel Cerakoted Graphite Black Machined for precise fitment of a Trijicon RMR Slide Cover plate and screws included Channel liner not installed or...

    MSRP: $275.99
    $210.99
    Add to Cart
  • MCS Glock 19 9mm Slide RMR Ready W/ Cover Plate MCS Glock 19 9mm Slide RMR Ready W/ Cover Plate

    Glock 19 9mm Slide RMR Ready W/ Cover Plate

    Gen 3 Compatible Fits Model 19/23 frames Accepts Polymer80 frames Machined from 416R Stainless steel Cerakoted Graphite Black Machined for precise fitment of a Trijicon RMR Slide Cover plate and screws included Channel liner not installed or...

    MSRP: $275.99
    $210.99
    Add to Cart
  • MCS Glock 26 9mm Slide RMR Ready W/ Cover Plate MCS Glock 26 9mm Slide RMR Ready W/ Cover Plate

    Glock 26 9mm Slide RMR Ready W/ Cover Plate

    Gen 3 Compatible Fits Model 26 frames Accepts Polymer80 frames Machined from 416R Stainless steel Cerakoted Graphite Black Machined for precise fitment of a Trijicon RMR Slide Cover plate and screws included Channel liner not installed or...

    MSRP: $275.99
    $210.99
    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
    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" 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
  • SALE
    MCS 7" 5.56 NATO UPPER ASSEMBLY (BUILT)

    7" 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