Barra 400E Polymer Ver. Standard Barrel Kit Law enforcement each Ace is stamped with

each Ace is stamped with the best in the deck—the Ace of Spades

the MCMR Series of handguards gives the shooter modularity in the M-LOK platform

Keep the BBs flying with a spare magazine for your Legends M3 Grease Gun 4

Compatible with most M4/ M16 Rifles

Barra 400E Polymer Ver. Standard Barrel Kit Law enforcement each Ace is stamped withUpgrade the internal barrel of your 400e Gen 2 Polymer rifle with this complete barrel kit, available in your choice of Standard or Precision barrel type. This kit is specifically designed for compatibility with the 400e Gen 2 Polymer, which uses a 357mm barrel length. The 400e Polymer first launched in October 2024 as part of the Gen 2 release. If you purchased your 400e Polymer between October 2024 and June 2025, your rifle came stock with a