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  M4E1 Threaded 12.5″ 5.56 Carbine Length Complete Upper Receiver w/ ATLAS S-ONE Handguard

  $484.99 – $509.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 14.5″ 5.56 Carbine Length Complete Upper Receiver w/ ATLAS R-ONE Handguard

  $489.99 – $514.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 14.5″ 5.56 Carbine Length Complete Upper Receiver w/ ATLAS S-ONE Handguard

  $489.99 – $514.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 14.5″ 5.56 Mid-Length Complete Upper Receiver w/ ATLAS S-ONE Handguard

  $495.99 – $519.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ .223 Wylde Complete Upper Receiver w/ ATLAS R-ONE Handguard

  $524.99 – $559.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ .223 Wylde Fluted Complete Upper Receiver w/ ATLAS R-ONE Handguard

  $564.99 – $594.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ .223 Wylde SS QPQ Complete Upper Receiver w/ 15″ M-LOK ATLAS R-ONE Handguard

  $529.99 – $559.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ .223 Wylde SS QPQ Complete Upper Receiver w/ 15″ M-LOK ATLAS S-ONE Handguard

  $529.99 – $559.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ .300 Blackout Complete Upper Receiver w/ ATLAS R-ONE Handguard

  $509.99 – $544.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ .300 Blackout Complete Upper Receiver w/ ATLAS S-ONE Handguard

  $509.99 – $544.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ 5.56 M4 Complete Upper Receiver w/ ATLAS R-ONE Handguard

  $495.99 – $529.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ 5.56 Mid-Length Complete Upper Receiver w/ ATLAS R-ONE Handguard

  $499.99 – $534.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ 5.56 Mid-Length No Forward Assist Complete Upper Receiver w/ 15″ M-LOK ATLAS R-ONE Handguard

  $525.99 – $539.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 16″ 5.56 Mid-Length No Forward Assist Complete Upper Receiver w/ 15″ M-LOK ATLAS S-ONE Handguard

  $504.99 – $529.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 18″ .223 Wylde QPQ Rifle Length Complete Upper Receiver w/ 16.6″ M-LOK ATLAS R-ONE Handguard

  $559.99 – $584.99 Select options This product has multiple variants. The options may be chosen on the product page
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  M4E1 Threaded 18″ .223 Wylde QPQ Rifle Length Complete Upper Receiver w/ 16.6″ M-LOK ATLAS S-ONE Handguard

  $559.99 – $584.99 Select options This product has multiple variants. The options may be chosen on the product page