Air Arms S400 Biathlon Air Rifle


  • Air Arms S400 Biathlon air rifle
  • Precharged pneumatic (200 bar max fill pressure)
  • Bolt-action
  • 5-shot repeater (self-indexing rotary clip)
  • Removable air reservoir
  • Match sights: globe front accepts inserts, rear diopter (not mounted)
  • Rear sight fits on an 11mm dovetail
  • 5-way adjustable match trigger
  • Lothar Walther barrel
  • White poplar stock
  • Cheekpiece adjusts vertically and horizontally
  • Buttpad adjusts vertically
  • 4 rotary clips fit in slots in right-hand forearm
  • Beautiful deep bluing
  • Stock is flawlessly executed
  • 29.875″ between front & rear sights
  • 10.25″ long accessory rail
  • 12.12″ to 12.50″ length of pull (LOP)
  • 5.15 ft-lbs.
  • Includes owner’s manual, 7 Allen keys, four 5-shot clips, fill adapter & spanner (to remove reservoir)

The Air Arms Precision Biathlon rifle delivers world-class accuracy. Air Arms is known for making extremely accurate guns, and the Biathlon is no exception. This air rifle is dressed in a unique white poplar stock with adjustable black cheekpiece and rubber buttpad. If you don’t shoot competitively and just want a very accurate repeater, remove the open sights and install a compact scope on the 11mm dovetail that holds the rear sight. Because the dovetail is very short, you’ll need to use a 2-piece mount.

Keep your extra rotary clips in the slots of the right-hand forearm. Load them before each match so there’s no fumbling when the pressure is on!


Caliber 0.177″ (4.5mm)
Max Velocity 564 fps
Muzzle Energy 5.15 ft/lbs
Loudness 2-Low-Medium
Barrel Length 20.5″
Overall Length 41.0″
Shot Capacity 5
Barrel Rifled
Front Sight Globe w/Aperture Inserts
Rear Sight Diopter/micrometer adjustable
Scopeable 11mm dovetail
Trigger Five-way adjustable match
Buttplate Adjustable
Suggested for Competition
Action Bolt-action
Safety none
Powerplant Pre-charged pneumatic
Function Repeater
Body Type Rifle
Weight 6.99 lbs
S401D17SX05APT [PY-2281-4570]
MPR Precision Biathlon air rifle, poplar stock, & adj. buttpad and cheekpiece. 5-shot repeater.

Caliber 0.177″ (4.5mm)
Max Velocity 564 fps
Muzzle Energy 5.15 ft/lbs

Additional information

Weight 6.99 lbs


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