First Look: Foxtrot Mike Mike-15 Gen 1 5.56 Upper Receivers

Monolithic uppers chambered in .223 Wylde.

posted on November 18, 2023
Foxtrot Mike upper

Foxtrot Mike Products is reintroducing the classic Mike-15 Gen 1 5.56 Barreled upper receivers. These newer Gen 1 Mike-15 upper receiver groups include some tweaks and improvements found on later generation Foxtrot Mike products to provide more performance and reliability. These assembled upper receiver groups include a lightweight M-Lok handguard but do not include a charging handle or bolt carrier group, which are sold separately by Foxtrot Mike Products.

Barrels on these new reissue Gen 1 Mike-15 upper receiver groups are button rifled, stress relieved and have a .223 Wylde chamber with a 1:8-inch twist rate. The combination of a “tighter” .223 Wylde chamber along with a 1:8-inch twist rate provides a higher degree of accuracy and the ability to stabilize heavier 5.56mm projectiles. Foxtrot Mike Barrels are made from 41V50 chrome-moly vanadium "barrel grade" steel blanks sourced from Gerdau, a high-strength steel alloy designed for heavy-duty applications. This material ensures better heat mitigation, abrasion resistance, corrosion resistance and tensile strength. The 41V50 steel blank undergo a button-rifling process for match-grade accuracy and precision, and then are treated with a durable QPQ (Melonite) exterior finish.

Foxtrot Mike Products Mike-15 Gen 1 5.56 Barreled Upper Specifications: 

  • M-Lok compatible handguard 
  • Proprietary double-pinned gas block with interlocking features. 
  • Monolithic style lightweight, modern AR-style upper receiver. 
  • 100-percent air-gauging of bore and rifling for consistent dimensions. 
  • All barrels produced in a single operation, guaranteeing quality.
  • Salt bath nitride coating for corrosion resistance and increased surface hardness. 
  • Available in 9-, 11.5-, 12.5-, 13.9- and 16-inch lengths. 

Foxtrot Mike Products new Gen 1 Mike-15 5.56 Barreled Upper Receivers have a starting retail price of $229 through $249 depending on barrel and M-Lok handguard length. To learn more about these uppers or other items from Foxtrot Mike Products, please visit


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