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    • AR Build Kits

    MCS Gearup carries a great selection of AR Build Kits. We have low cost kits starting under $79 and premium kits at competitive prices. Many of our AR build kits have everything you need to complete a fully functioning rifle except the lower receiver (and of course a magazine). They’re cost-effective ways to complete a customized rifle on your own time. Customize in your choice of caliber, barrel length, buffer weight, handguard style, gas system, furniture, and much more, in many different colors. We also carry bufferless builds and short build kits for AR pistols, all Backed by our satisfaction guarantee.

    • SALE
      MCS 5" 5.56 NATO UPPER ASSEMBLY (BUILT) MCS 5" 5.56 NATO UPPER ASSEMBLY (BUILT)
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      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: $289.99
      Add to Cart
    • SALE
      MCS 5" 5.56 NATO UPPER ASSEMBLY WITH BCG (BUILT) MCS 5" 5.56 NATO UPPER ASSEMBLY WITH BCG (BUILT)
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      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
    • MCS USA Made AR15 Complete Upper Receivers with BCG MCS USA Made AR15 Complete Upper Receivers with BCG
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      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" .300 BLACKOUT UNASSEMBLED PISTOL KIT W/LPK
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      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 5" 7.62X39 COMPLETE UPPER ASSEMBLY WITH BCG (BUILT)
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      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
    • SALE
      MCS Glock RMR Build Kit 17/19/22/26 MCS Glock RMR Build Kit 17/19/22/26
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      Glock RMR Build Kit 17/19/22/26

      New MCS competition RMR glock build kit. With this upgraded build kit, you will be able to have almost all of the necessary components to build your very own RMR ready competition glock pistol. Available for G17/19/22/26 Glock Slide RMR Ready Gen 3...

      MSRP: $400.99
      Was: $375.99
      Now: $354.99
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