Challenge Gun

Seen on Outdoor Channels Elite Tactical Unit

The SIGM400™ direct impingement AR-platform rifle system is built with the same style lower as the SIG516® and offers operators ambidextrous operating controls, integral quick-detach sling swivel mounts, and a built-in tensioning device between the upper and lower receivers to maximize accuracy. Chrome-lined barrels keep cleaning to a minimum and increase operational life.

The SIGM400 Enhanced models feature flip-up rear sights and Magpul MOE handguards, buttstocks and pistol grips. Three versions are available: black, Olive Drab (OD) and Flat Dark Earth (FDE). The SIGM400 Enhanced FDE features a Cerakote® finish to match the Magpul MOE products. These popular furniture options give the SIGM400 Enhanced a distinctive look and maximum durability.

More Information at


  • 16" Chrome lined 1:7 bbl 5.56mm NATO
  • MagPul stock, grip, forend
  • Flip rear, A2 F marked front sight
  • ambi mag release, integral QD
  • Item Number: RM400-16B-EC-FDE
  • Action: Semi-auto
  • Operating System: Direct impingement
  • Caliber: 5.56 X 45mm NATO
  • Overall Length: 35.6 in
  • length w/Stock Collapsed: 32.5 in
  • Overall Height: 7.8 in
  • length w/Stock Collapsed: 32.5 in
  • Trigger Weight: 7.6 lbs
  • Barrel Length: 16 in
  • Rifling Twist: 1 in 7 in
  • Grooves: 6
  • Weight w/out Mag: 6.7 lbs
  • Mag Capacity: 30 Rounds
  • Mag Type: Magpul PMAG
  • Features: Magpul Moe forend, grip, and stock
  • MSRP: $1,260.00
  • CA Compliant: No
  • MA, NJ, NY, CT Compliant: No

Next Weapon