Created with Sketch. Created with Sketch.
Toggle menu
Have a question? Live support call 888-279-6661

Shop by Category

  • .223 Wylde
  • .300 Blackout
  • .350 Legend
  • .45 ACP
  • 1911
  • 5.56 Nato
  • 6.5 Creedmor
  • 6.5 Grendel
  • 7.62x39
  • 9mm Luger
  • 4.5" Uppers
  • 5" Uppers
  • 6" Uppers
  • 7.5" Uppers
  • 10.5" Uppers
  • 16" Uppers
  • Accessories/Tools
  • AK-47
  • Anodized Parts
  • AR 5" Inch Builds
  • AR Build Kits
  • AR Pistol Build Kits
  • AR Rifle Build Kits
  • AR Lower-Parts
  • AR Upper Parts
  • AR Upper Receivers
  • AR-10
  • AR-15/M4
  • AR-40
  • Assembled Uppers
  • Barrels
  • Beretta
  • Bipod's
  • Bolt Carrier Groups
  • Bolt Catch
  • Buffers
  • Buffer Tubes
  • Buffer Tube Kits
  • ButtStocks
  • Castle Nuts
  • CAMO
  • Cerakote
  • Charging Handles
  • Closeout Specials
  • Combo Deals
  • Dust Covers
  • End Plate
  • Forward Assists
  • Furniture Sets
  • Gas Tubes/ Gas Blocks
  • Glock
  • Gold Parts
  • Gradient
  • Grips
  • GSG-5
  • Hand Stop's
  • Holsters
  • Lasers & Lights
  • Lower Part Kits
  • .22 LR
  • Magazines
  • MCK Micro Conversion Kits
  • MCK Accessories
  • MX-1 Conversion Kits
  • MX-1 Accessories
  • Apex Conversion Kits
  • Apex Accessories
  • Micro AR-15 Builds
  • Mounts & Risers
  • Muzzle Brakes
  • Optics
  • Pistol Braces
  • Pistol Slides
  • Rails & Handguards
  • Raw Parts
  • Recoil Reduction Systems
  • Safety Selector's
  • Saiga
  • Short Barrel Uppers
  • Short Buffer System
  • Shotgun
  • Sig Sauer
  • Side-Charging AR Kits
  • Sights
  • Silent Recoil Springs
  • Skeletonized Parts
  • Slings
  • Smith & Wesson
  • Splatter
  • Tactical Knives
  • Tactical Range Bags
  • Tactical Vests
  • Takedown Pins
  • Triggers
  • Trigger Guards

    • Shop by Brand

  • MCS
  • CAA
  • Meta Tactical
  • Trinity Force
  • Presma
  • XTS
  • JE Machine tech
  • SB Tactical
  • Olight
  • Northtac
  • View all Brands
  • .223 Wylde
  • .300 Blackout
  • .350 Legend
  • .45 ACP
  • 1911
  • 5.56 Nato
  • 6.5 Creedmor
  • 6.5 Grendel
  • 7.62x39
  • 9mm Luger
  • 4.5" Uppers
  • 5" Uppers
  • 6" Uppers
  • 7.5" Uppers
  • 10.5" Uppers
  • 16" Uppers
  • Accessories/Tools
  • AK-47
  • Anodized Parts
  • AR 5" Inch Builds
  • AR Build Kits
  • AR Pistol Build Kits
  • AR Rifle Build Kits
  • AR Lower-Parts
  • AR Upper Parts
  • AR Upper Receivers
  • AR-10
  • AR-15/M4
  • AR-40
  • Assembled Uppers
  • Barrels
  • Beretta
  • Bipod's
  • Bolt Carrier Groups
  • Bolt Catch
  • Buffers
  • Buffer Tubes
  • Buffer Tube Kits
  • ButtStocks
  • Castle Nuts
  • CAMO
  • Cerakote
  • Charging Handles
  • Closeout Specials
  • Combo Deals
  • Dust Covers
  • End Plate
  • Forward Assists
  • Furniture Sets
  • Gas Tubes/ Gas Blocks
  • Glock
  • Gold Parts
  • Gradient
  • Grips
  • GSG-5
  • Hand Stop's
  • Holsters
  • Lasers & Lights
  • Lower Part Kits
  • .22 LR
  • Magazines
  • MCK Micro Conversion Kits
  • MCK Accessories
  • MX-1 Conversion Kits
  • MX-1 Accessories
  • Apex Conversion Kits
  • Apex Accessories
  • Micro AR-15 Builds
  • Mounts & Risers
  • Muzzle Brakes
  • Optics
  • Pistol Braces
  • Pistol Slides
  • Rails & Handguards
  • Raw Parts
  • Recoil Reduction Systems
  • Safety Selector's
  • Saiga
  • Short Barrel Uppers
  • Short Buffer System
  • Shotgun
  • Sig Sauer
  • Side-Charging AR Kits
  • Sights
  • Silent Recoil Springs
  • Skeletonized Parts
  • Slings
  • Smith & Wesson
  • Splatter
  • Tactical Knives
  • Tactical Range Bags
  • Tactical Vests
  • Takedown Pins
  • Triggers
  • Trigger Guards

    • Shop by Brand

  • MCS
  • CAA
  • Meta Tactical
  • Trinity Force
  • Presma
  • XTS
  • JE Machine tech
  • SB Tactical
  • Olight
  • Northtac
  • LUTH-AR
  • Shockwave
  • Fab Defense
  • Rise Armament
  • Armaspec
  • VELOCITY
  • Sylvan Arms
  • CMC Triggers
  • LBE Unlimited
  • Tac Fire
  • UTG Leapers
  • View all Brands

    • 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)
      Quick view

      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)
      Quick view

      5" 5.56 NATO UPPER ASSEMBLY WITH BCG (BUILT)

      MCS 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: $450.99
      Was: $389.99
      Now: $379.99
      Add to Cart
    • MCS USA Made AR15 Complete Upper Receivers with BCG MCS USA Made AR15 Complete Upper Receivers with BCG
      Quick view

      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
      Quick view

      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: $499.99
      Was: $429.99
      Now: $399.99
      Add to Cart
    • SALE
      MCS 5" 7.62X39 COMPLETE UPPER ASSEMBLY WITH BCG (BUILT)
      Quick view

      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
    • MCS 5" 5.56 NATO FORGED UPPER ASSEMBLY (BUILT)
      Quick view

      5" 5.56 NATO FORGED UPPER ASSEMBLY (BUILT)

      MCS 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 parts at the best prices.     5.56 NATO AR-15 Upper Specifications: Sizes...

      MSRP: $375.99
      $289.99
      Add to Cart
    • MCS AR-15 5.56 NATO 5'' PISTOL KIT - BLUE FLAME
      Quick view

      AR-15 5.56 NATO 5'' PISTOL KIT - BLUE FLAME

      Includes: 5.56 NATO PISTOL 5" INCH PISTOL LENGTH BARREL 1:5 5R TWIST - BLACK NITRIDE (MADE IN USA) AR-15/47/9/300 Stripped Upper Receiver (Made in USA) AR-15 4" Combat M-Lok Handguard "C" cut- Black .750 LOW PROFILE STEEL GAS BLOCK WITH ROLL PINS &...

      MSRP: $469.99
      $395.99
      Add to Cart
    Compare Selected