Air Arms S400 Biathlon Air Rifle

Air Arms S400 Biathlon Air Rifle

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PY-2281-4570

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$1,399.99

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  • Description
  • Specifications
  • Customer reviews
  • Q & A: 1 answered question
  • PCP Hookup
  • 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!
See manual
See schematics

other products by Air Arms

Caliber0.177" (4.5mm)
Velocity564 fpsMeasured with 7.7-grain ammo
Loudness2-Low-Medium
Barrel Length20.5"
Overall Length41.0"
Shot Capacity5
BarrelRifled
Front SightGlobe with Aperture Inserts
Rear SightDiopter/micrometer adjustable
Scopeable11mm dovetail
TriggerFive-way adjustable match
ButtplateAdjustable
Suggested forCompetition
ActionBolt-action
SafetyNone
PowerplantPre-charged pneumatic
FunctionRepeater
Body TypeRifle
Weight6.99 lbs
See manual
See schematics

other products by Air Arms

Average Customer Review

5.0 (3 reviews)
5 star:4 star:3 star:2 star:1 star:
(3 votes)
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5.0 5.0

4.0 4.0

5.0 5.0

By Robert from USA on 2012-07-10
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4.01 rating

Things I liked: Accurate and fun to shoot.

Things I would have changed: Expensive. For the money should have included Butt Spacers and Front Aperture Inserts. Would have also been nice if a prone position sling was offered.

What others should know: For target practice order the 10 pellet clip and you will not have to reload as often.

5.0 5.0

5.0 5.0

5.0 5.0

By Mary Ann from USA on 2012-05-07
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5.01 rating

Verified Purchase

Things I liked: What a great rifle. The accuracy is incredible. The weight and adjustable features are terrific. A truly great air rifle

Things I would have changed: I am not convinced on the number of shots per fill, I find that I am between two and three hundred before I need to refill. Other than that a great piece of gear.

5.0 5.0

5.0 5.0

5.0 5.0

By Craig Airman from USA on 2010-03-18
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5.01 rating

Things I liked: There are so many things about this gun to like it is hard to start. The balance and the feel of this gun is unreal and the adjustments to make it fit your body, enhance the experience. The trigger is as smooth as silk and pulls the pellet right to the target. It seems like it shoots forever on a single charge. It is very nice to have 20 rounds to shoot off without having to reach into a pellet container. It is quite and doesn't let your neighbors know what you are up to in your backyard. The gun instills confidence in you and when you miss you know that it is your technique to blame and not the gun. After a quick sight in, I was doing dime size clusters of 20 rounds quicker than you could say Air Arms, because of the 4 magazines. When you look at it there is no question that this is a quality rifle.

What others should know: You will need a few adapters to be able to use a hand pump with this gun. It seems to take longer to pump up by hand then my other PCPs. My son is left handed and doesn't seem bothered by the right handed stock when he shoots it.

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  • Thuy from USA asked:

    I have a Joe Brancato 4500psi air cylinder that I use to fill a Benjamin Marauder. What kind of adapter do I need to use this tank with the Air Arms S400 Biathlon Rifle. Thank you.

    • 103David from USA asked:

      So the question is this; Intersted in the Biathilon rifle, but...is it possible to get it in something other than the cheesy white paint job?

      • Val from USA:

        unfortunately not, this model only comes in this particular stock

    To fill your PCP gun:
    1. Pick a source of air shown at right
    2. If an adapter is needed, one will be shown
    3. Add both to your cart to get hooked up

    Air Arms S400 Biathlon Air Rifle with DIN connector (5M)

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    Item Description

    In stockS401D17SX05APT [PY-2281-4570]
    MPR Precision Biathlon air rifle, poplar stock, & adj. buttpad and cheekpiece. 5-shot repeater.
    Caliber0.177" (4.5mm)
    Max Velocity564 fpsMeasured with 7.7-grain ammo
    Muzzle Energy5.15 ft/lbs

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