[Air Arms] S400 MPR (Multi-Purpose Rifle) Biathlon Multi-Shot

Description:

The Air Arms S400 MPR (Multi-Purpose Rifle) Sporter Field Target is a premium British-made pre-charged pneumatic (PCP) multi-shot side-lever air rifle in .177 caliber (4.5mm), built on the legendary S400 platform.

Air Arms designed the MPR series specifically for competitive target shooting, with the Sporter variant aimed at younger or smaller-framed shooters (or sporter/10m disciplines) and the FT (Field Target) configuration optimized for outdoor multi-position events like Field Target (FT) and Hunter Field Target (HFT).

Quick Specs

It features a precision Lothar Walther barrel, a highly adjustable match-grade trigger (with first- and second-stage adjustments), an ambidextrous lightweight poplar wood stock with fully adjustable cheekpiece and buttpad, a removable air reservoir with built-in pressure gauge, and an 11mm dovetail rail (FT versions often have a raised rail for scopes).

It’s self-regulated for outstanding shot-to-shot consistency, delivering 80–120+ shots per fill depending on tune and configuration. Power is sub-12 ft-lbs (no FAC needed in the UK), typically optimized around 5–7 ft-lbs (~500–540 fps) for pure target work, though many owners tune the S400-based action up to ~11–12 ft-lbs for FT use while maintaining tight groups.

The rifle is quiet (low-medium loudness), has minimal recoil, and is balanced for prone, kneeling, and standing positions—making it truly multi-positional as the name suggests.

 

Why It’s a Great Rifle

Outstanding accuracy and consistency right out of the box: The match barrel and regulated action produce pellet-on-pellet groups that rival far more expensive rifles. Users consistently report excellent performance at 10–55 yards (and beyond when tuned), making it a favorite for competition.

Superb ergonomics and adjustability: The stock, cheekpiece, buttpad, and trigger let you dial it in perfectly to your body and shooting style—reducing fatigue and improving scores in any position.

Reliable British engineering: Air Arms builds it with the same care as their flagship guns. It’s proven over 20+ years, with a smooth side-lever, durable components, and excellent customer support.

Incredible value: You get ~80% of the performance of high-end match rifles (like some EV2 or top-tier 10m guns) for a fraction of the price. It’s often described as “punching well above its weight.”

Versatile and upgradable: Start in Sporter config and easily upgrade to Precision/FT features (butt hook, longer tube, etc.) as your skills grow.

 

What It’s Good For

Competitive target shooting: Excels in Field Target (FT), Hunter Field Target (HFT), 10m precision (indoor/outdoor), and multi-position disciplines (prone/kneeling/standing). Many clubs and junior programs use it for training and competition.

Recreational plinking and practice: Fun, quiet, and forgiving for backyard or range sessions.

Light pest control/hunting (when tuned appropriately): The S400 action is capable in .177 for small game at reasonable ranges, though it shines brightest as a dedicated target gun.

All ages and skill levels: The Sporter version is junior-friendly; adults love the FT variant for serious competition or skill-building.

 

Why You Should Buy It

If you want a rifle that grows with you—from beginner to serious competitor—without breaking the bank, the S400 MPR Sporter/Field Target is one of the smartest choices in airgunning.

It offers championship-level precision, a custom-fit feel, and rock-solid reliability at a price that makes it accessible (typically far less than dedicated match rifles costing twice as much). Reviews across the board call it a “fantastic all-rounder” that delivers pro-level results with minimal fuss.

It’s not the absolute top-tier competition gun for world championships (those often cost 2–3x more), but for 95% of shooters—club-level FT/HFT, 10m practice, or just becoming a better marksman—it’s hard to beat.

Plus, Air Arms’ after-sales support is legendary.

If you’re serious about improving your shooting, love the idea of a rifle you can tweak and upgrade over time, and want something that feels premium without the premium price tag, this is the one.

Grab a good scope or diopter sights, a few tins of quality pellets (like Precision or Air Arms Diabolo), and you’ll be punching tight groups and winning matches in no time. Highly recommended!