Challenge Gun

Seen on Outdoor Channels Elite Tactical Unit

The SIG551-A1® is a semi-automatic, American-built version of the SG 551 currently in service with the Swiss Army. An adjustable, 2-position gas piston operates a rotating bolt, giving long service life and reliable operation in the most unforgiving environments.

Featuring the trademark 550-series flash suppressor, genuine Swiss forearm, folding buttstock, and distinctively translucent curved magazine give the SIG551-A1 its authentic look. Additionally, the upper and lower have a custom grey finish, similar to the original SG 550-series.

An M1913 Picatinny top rail allows the operator to mount any number of optics. Included is a rotary diopter sight, calibrated from CQB distances out to 300 meters.

More Information at


  • 16" bbl 1:7 twist 5.56mm
  • 2 position gas piston
  • Side folding stock
  • Rotary diopter sight system
  • Item Number: R551A1-F16B-C-RD
  • Caliber: 5.56X45mm NATO
  • Overall Length: 36.1”
  • Length w/Stock Collapsed: 34.6”
  • Length w/Stock Folded: 26.0”
  • Barrel Length: 16”
  • Rifling: 1 in 7 in
  • Sight Radius: 18.0”
  • Forearm: Polymer
  • Stock Type: Swiss Type
  • Weight w/out Mag: 7.0 lbs
  • Operating System: Gas piston, rotating bolt
  • Mag Capacity: 20/30 rounds
  • Features: Swiss type folding stock, rotary diopter sighting system
  • MSRP: $1,599.00
  • CA Compliant: No
  • MA, NJ, NY, CT Compliant: No

Next Weapon