Tags: Weapon.
The Remington GPC (or Remington R4) introduced in 2010 was a AR-15 derivative with an extruded upper receiver acting as a barrel cooling jacket mounted with STANAG rails. A derivative product called the Modular Gas Piston Carbine was being offered to the US Army for its Aborted Improved M4A1 Program . It features a Ferritic Nitrocarburized (FNC) coating 10.5 inch or 14.5 inch barrel offerings with a six groove 1:7 right hand twist.