Air Arms S400 MPR FT, Poplar Stock


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  • Description
  • Specifications
  • Customer reviews
  • Q & A: 1 answered question
  • PCP Hookup
If you enjoy winning field target matches, the Air Arms S400 MPR FT (multi-purpose rifle field target) can help you achieve your goals!

The gun is highly adjustable to meet your individual shooting needs. The match trigger is not only adjustable for first-stage length and second-stage pull weight, but it also can be moved up or down and forward or back. Plus, the trigger pad can be adjusted! An adjustable cheekpiece moves up and down to align your eye with the rear sight, while the thick rubber buttpad is also adjustable. If you need a longer pull, unscrew the buttpad and add spacers (not included).

There are no sights on the gun, so be sure to get a scope and mount!

This is a breechloader and the S400 MPR FT has a 12-groove Lothar Walther barrel and poplar stock. The correct air pressure for the MPR is 200 bar (2,900 psi).

The tank is not removable. You refill it while it's attached to the gun.

You don't have to reserve this gun just for field target. It makes a very nice hunting rifle, too. It's ideal for dispatching small rodents and garden pests.
See manual
See schematics

other products by Air Arms

Caliber0.177" (4.5mm)
Velocity800 fps
Barrel Length18.58"
Overall Length39.0"
Shot Capacity1
Front SightNone
Rear SightNone
Scopeable11mm dovetail
Suggested forSmall game hunting/target practice
PowerplantPre-charged pneumatic
Body TypeRifle
Weight6.94 lbs
See manual
See schematics

other products by Air Arms

Average Customer Review

4.5 (5 reviews)
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4.0 4.0

5.0 5.0

5.0 5.0

By Gary from USA on 2014-01-04
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4.01 rating

Things I liked: I bought this gun to shoot benchrest competition. It is about one-half to one-third the cost of other guns that are competitive in the Light Varmint class (12 fpe) for WRABF/USARB benchrest, shooting at 25 meters outdoors and 25 yards indoors.

Things I would have changed: The Air Arms T-Bar fill valve sucks, especially when it is cold. Getting the fitting on and off the gun is a real PITA. I have ordered a kit from Best Fittings Ltd, in England, to change the valve to a foster quick detach type. I am pretty tall, so the stock length of pull is way too short for me for position shooting, but not so much of a problem for shooting from benchrests. I would need to get some sort of after market extender to shoot Field Target with it.

What others should know: The gun is a little "pellet picky", at least for hitting a 10 ring that is less than half the diameter of a .177 pellet. It doesn't seem to group any wadcutters very well(of which I have 10'000). I have found that several Air Arms, or the pretty much identical JSB Exact, domed pellets, seem to shoot well. With a little patience, the trigger can be adjusted down to practically nothing, which is great for BR, but possibly not so much for FT. Overall, I am quite pleased with the gun and think it is a great value for the money.

5.0 5.0

5.0 5.0

5.0 5.0

By RAM from USA on 2013-02-04
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0.00 ratings

Things I liked: I love this rifle! I have a 3-12-44 accushot scope mounted, if you miss it's your fault. very nice trigger.

Things I would have changed: nothing

5.0 5.0

5.0 5.0

5.0 5.0

By Bruce from USA on 2012-12-03
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5.02 ratings

Things I liked: Great accuracy. Incredible bang for the buck. This is really a beautiful little rifle and it is a pure joy to shoot. It has a great track record winning FT meets, too - so it's pretty much up to us, the shooters! And my wife thinks it's pretty (that's important!)

Things I would have changed: The stock is WAY too short. With all of the extensions added, it still comes up at least 1 inch shy. And the plastic extensions really don't fit the beauty of the rifle - they are extremely cheesy-looking. Solution: budget in the "MPR Metal Adjustable Buttpad" - you will still come out way ahead cost-wise over anything else. Or you can build a decent-looking extension with standard off-the-shelf spacer components and longer 5mm, 80 pitch machine screws. I used 70mm length for adding 2 inches of spacers (waiting for my metal buttpad to come in this week). Mounting a Hawke 30 Sidewinder scope with heavy-duty BKL mounts, I pretty much ran out of forward room. Extending the stock solved this problem, though, giving me more eye relief. You'll also have to fab a new cheek piece for the longer stock. I made one out of a simple 1x2x6" piece of wood, edges shaped & sanded, stained walnut, and mounted right on the original mount. It looks stylish and business-like, and it works great! The bluing is really old-fashioned. We're used to non-rust finishes, and you'll need to oil the gun after every use. So....why five stars? Because these are easy fixes and you're left with a fantastic piece of equipment that you will absolutely love! Besides, we all tweak stuff anyway, don't we? It's part of owning something that you want to put your own personality into.

What others should know: Filling the cylinder! The online manual is wrong (at least at this writing). The cylinder fills without removal, with a special adapter that comes with the kit. The problem: BPP (British Parallel Pipe) threads! You won't be able to fill your rifle without something to mate the BPP to standard fittings. My solution: The "AirForce Scuba Tank Adapter K-valve, Steel Hose". I removed the hose Foster connector and replaced it with an adapter PN# BPP-FP-5000-02-02, which accepts BPP and standard pipe threads. You'll need to order this from your local industrial supply store, so PLAN AHEAD. Use some teflon tape on the standard pipe side (tapered), but not on the BPP (straight) side. Instead use a 3/8" brass washer and tighten it down pretty well. I've seen some fill adapters online but be careful - they may be for the older removable tank system. Pellets! These group the best: 1. JSB Exact Diabolos, 8.44 gr. 2. Air Arms Diabolo Field, 8.4 gr. 3. Falcon Accuracy Plus, 7.33 gr. Generally, heavier pellets fly best, but the Falcons are very impressive even at the lighter mass, meaning they will fly farther/flatter.

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  • Virgilio from USA asked:

    How loud is this air rifle? It is not shrouded.

    • Virgilio from USA:

      Several air gun owners on air gun forums have stated that this air rifle without a shroud is very loud.

    • Jerry from USA:

      It's listed at 2-low-med, which is fiarly quiet

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 MPR FT, Poplar Stock with 1/8" BSPP connector (2M)

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Item Description

Limited Quantities S401F17SX12ADTU [PY-2225-6133]
Item ConditionRefurb
Air Arms S400 MPR
Caliber0.177" (4.5mm)
Max Velocity800 fps

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