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  • MCS 5" 300 BLACKOUT COMPLETE UPPER ASSEMBLY WITH BCG (BUILT)
  • MCS 5" 300 BLACKOUT COMPLETE UPPER ASSEMBLY WITH BCG (BUILT)

    • 5" 300 BLACKOUT COMPLETE UPPER ASSEMBLY WITH BCG (BUILT)

    MSRP: $429.99
    Was: $389.99
    Now: $369.99
    (You save $60.00 )
    (3 reviews) Write a Review
    SKU:
    BU-300-5


    Product Description

    (BUILT) USA Made 5" 300 BLACKOUT 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 prices. 
    • Sizes 5"
    • USA Made Forged 7075-T6 Black Stripped Upper
    • Black Nitrate BCG
    • USA Made Black Dust Cover
    • USA Made Black Forward Assist
    • 300 BLACKOUT Caliber  1:7 Twist
    • USA Made .750 Lower Profile Gas Block
    • USA Made AR-15 Birdcage
    • USA Made Free Float Handguard Black

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    Product Reviews

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    3 Reviews Hide Reviews Show Reviews

    • 5
      300blk upper

      Posted by baby glock on Oct 4th 2026

      Fire best upper would recommend follow my insta @lilmeechie46

    • 5
      None

      Posted by baby glock on Sep 28th 2026

      I honestly love it and go follow my ig at @lilmeechie46

    • 5
      Micro upper review

      Posted by Waldemar Sotillo on May 8th 2023

      Very fun to use work for me flawlessly

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