FX Impact M4, Image 1
FX Impact M4, Image 1

FX Impact M4 Compact PCP Air Rifle

rating
4.58 reviews
11 answered questions

$1,999.99

Caliber:.177 (4.5mm)

.177 (4.5mm)
.22 (5.5mm)
.25 (6.35mm)
.30 (7.62mm)

Color:Black

Black

Quantity:

1
Only 4 Left in Stock

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Description

Swedish manufacturer FX Airguns continues to turn out new models, blending power and accuracy into a very small package with the new Impact M4 Compact! Featuring a 500mm barrel and an overall length of just 25", the Compact only comes up short in one area, and that's the length!  A stubby 300cc removable carbon fiber bottle is the only other departure from the standard Impact, and still provides a solid shot count despite the small size. 

From a 250 BAR fill, you can expect up to 150 shots in .177, 110 shots in .22, 70 shots in .25 and 30 shots in .30 caliber.  With plenty of energy to accompany those shot counts, you can expect up to 25 FPE in .177, 45 FPE in .22, 60 FPE in .25 and a whopping 80 FPE in .30!  Long time fans and followers of the Impact platform may recall that early versions of the standard size rifle produced about those same specs, with a longer barrel and larger air cylinder.  FX is able to achieve this impressive stat line thanks to the power plenum 750!  Adding 75cc of firing chamber volume and new valving allows for these impressive numbers that simply couldn't be achieved before this innovation. 

This is also due, in part, to the rear Power Block. While the power plenum stages the power capabilities of the FX Impact, the rear block handles that transfer of power much like a car’s carburetor. FX redesigned the rear block and the valve housing which allows for better airflow, efficiency, and power potential. The Power Block will be especially useful for those who desire to shoot heavy slugs. Those shooting heavy slugs are encouraged to add the FX Impact Tungsten Hammer weight to also allow for higher working pressures.

Of course, the rest of the rifle packs all the innovation the Impact is known for. This includes the AMP MKII regulator, external hammer spring adjustment and valve control. Otherwise known as the new Quick Tune System, this easy-to-adjust system is unlike any other on the market!  The Compact still utilizes the Smooth Twist X Superior barrel liner system, which has proven to be astonishingly accurate. This means you can easily change out calibers and liners. You can even turn your Impact Compact into a standard size Impact if you so desire.  The possibilities are truly endless with this platform!

 

 

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FX Impact M4 Compact PCP Air Rifle

  • 500mm FX Smooth Twist X Superior (STX) Barrel System
  • End of shroud is threaded 1/2" x 20 to accept a moderator (not included)
  • Interchangeable Calibers and Barrel Liners (Sold Separately)
  • Power Block
  • 25” Overall Length
  • Featuring the new FX Quick Tune System for nearly tool-free tuning
  • Externally Adjustable AMP MKII (Adjustable Match Precision) Regulator
  • Externally Adjustable Hammer Spring Tension with Macro and Micro adjustments 
  • Externally Adjustable Valve Control
  • 250 BAR (3,625 PSI) Max Fill Pressure
  • 170 BAR max regulator working pressure
  • Equipped with the 75cc Power Plenum 750 - allowing for an even wider range of power adjustment
  • .22 and .25 cal M4's feature Dual transfer ports - one optimized for pellets, one for slugs
  • Male Quick Disconnect Fitting
  • Reversible Forward Mounted Sidelever Cocking
  • Removable 300cc Carbon Fiber Air Cylinder (Additional Cylinders Sold Separately)
  • Picatinny/Weaver optics mounting rail with 30 MOA compensation rides on 11mm dovetail allowing further customization to meet every shooters need
  • Picatinny accessory rails below cylinder and on each side of the forearm
  • New Quick Set Trigger - Adjustable match trigger
  • Wika dual pressure gauges: one for air cylinder pressure, one for regulator pressure.  
  • 6.1 Lbs overall weight
  • Height Adjustable Rubber buttpad
  • FX UG1 AR15 style grip
  • AR15 style manual safety
  • Redesigned Side Shot magazine capacity*: 34 rds. in .177, 28 rds. in .22, 25 rds. in .25, 23 rds. in .30
  • Maximum Muzzle Energy: 25 FPE in .177, 45 FPE in .22, 60 FPE in .25, 80 FPE in .30
  • Includes one side shot magazine and 3 year transferable warranty

*  - Older Side Shot magazines are compatible with the M4. 

Tech Note: While the manual states the M4 models are capable of 300 BAR fill pressures, this is only achievable with aftermarket carbon fiber bottles. The current factory bottles from FX that are included on the rifles are rated for 250 BAR fill pressures and should not be filled over this pressure.

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Specifications

Caliber
.177 (4.5mm)
Max Velocity
920 fps
Muzzle Energy
25 ft/lbs
Suggested for
Small game hunting/target practice
Powerplant
Pre-charged pneumatic
Loudness
4-Medium-High
Weight
6.1 lbs
Function
Repeater
Max Shots per Fill
150
Cylinder Size
300 cc
Action
Sidelever
Fixed/adj. power
Multiple settings
Shrouded
Yes
Scopeable
Weaver/Picatinny
Front Sights
none
Rear Sights
none
Safety
Manual
Trigger
Two-stage adjustable
Barrel
Rifled
Barrel Length
19.68"
Overall Length
25.0"
Capacity
34 round(s)
Body Type
Rifle
Buttplate
Adjustable
Grip
Ambi
Color
Black
Operating Pressure
3625 PSI / 250 BAR

Ballistic & Conversion Calcs

FX Impact M4

Introducing the FX Impact M4 Compact! This powerhouse packs unmatched accuracy into a 25" frame with a 500mm barrel. Despite its compact size, the 300cc carbon fiber bottle ensures a solid shot count: 150 shots in .177, 110 in .22, 70 in .25, and 30 in .30 caliber. Featuring the Power Plenum 750 and Power Block, it delivers impressive energy up to 80 FPE. Experience unparalleled precision with the AMP MKII regulator and Quick Tune System. Unleash your potential with FX Impact M4.

FX Impact
FX quick set trigger

Introducing the FX quick set trigger. Switch from hunting to match grade with one screw. Plus, a stronger magazine and the new brass piston AMP MKII regulator for higher pressures and faster refresh rates.

rear Power Block

The M4 Compact's rear Power Block boosts power transfer, ideal for heavy slugs. Pair with the Tungsten Hammer weight for higher speeds and power, delivering unmatched performance for serious shooters.

new rigid top plate

The M4 Compact's new rigid top plate and customizable scope rail system enhance performance and shooting experience. Adjust the rail for perfect eye relief or mount directly on the 11mm dovetail for versatility.

This modern PCP air rifle

Discover the FX Impact M4 Compact! This powerhouse delivers unmatched accuracy in a 25" frame with a 500mm barrel. Enjoy a solid shot count, impressive energy up to 80 FPE, and unparalleled precision with the AMP MKII regulator. Unleash your potential today!

PCP Fill Options

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Overall Rating

rating
4.58

Ratings

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Tell us what you think

8 of 8 FX Airguns Impact M4 Compact Reviews

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Most Recent
Overall rating
rating
5
Value for money
rating
5
Accuracy
rating
5

I literally pounded a nail with a head barely larger than a .177 pellet in a board at 20 yards with my .177 barrel and jsb pellets. In .30 the power is incredible and just as accurate. Again jsb pellets. I have a sarissa installed on it and it makes basically no noise. Thing is a dream I had pyramyd test it and zero problems after thousands of shots. I am no expert and this thing is very easy to tune with pellets.

Nothing

Expensive but no buyers remorse.

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Helpfull Review?
Overall rating
rating
5
Value for money
rating
5
Accuracy
rating
5

The impact has been a great gun. Amazingly accurate, and easy to tune.

Nothing

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Helpfull Review?
Overall rating
rating
2
Value for money
rating
1
Accuracy
rating
2

The build quality is good, like all FX airguns.

#1 would be accuracy! (18.13gr JSB) This gun falls WAY behind any FX I have owned. The valve adjuster can only max at 4 lines, not 5+ like the longer versions. It should come with a moderator because it is a 5 sound level without one.

I am HUGELY DISAPPOINTED with this gun. I own over 30 PCP airguns, and at least a dozen are FX. FX are always my favorites, but this gun is just garbage as far as accuracy. When I received it new from PyramydAir the adjustments were all off the chart. So I contacted FX and they explained that because it is the compact version all normal settings would not apply, except the REG 1 was set at 1700+ which they agreed should have been 1500. They said yes, you can not adjust the valve over 4 lines on that gun, but you don't need to ( I disagree, but that is what they said). All in all, I wish I could get a refund because I don't like this gun at all, it is nowhere as good as my Gen1 Impact .25 which I love very much.

Matt May 13, 2022

OVERPRICED JUNK!! I would never buy a FX. Every youtube review, you clearly see there sponsored by FX and get them free. Teds holdover, etc all bogus! Of course they don't tell you the truth. FX charges Insane prices for everything. You want accessories, It costs ridiculous prices! Barrel liners are, what, over $350! Mags, bipods, moderators, barrels etc all crazy. They only can shoot small tiny pellets or slugs. The mags wont hold big slugs, and they dont even have close to the power to sling them. One of my buddy's has a new .35 Impact, nothing but countless problems. Leaks all the time, mag not cycling, bolt jammed, bolt pins worn out, reg problems, guage problems. My other buddy has a Custom XP airguns .35 and a Custom quackenbush .35, It will hit golf balls at 200 yards and puts out 300-400 ft-lb, has taken big deer over 100yds, been solid reliable for 10 years and cost $800 less than the Impact!! FX guns shoot fantastic when dialed in but there overpriced, fragile, prone to probs

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Helpfull Review?(2)
Overall rating
rating
5
Value for money
rating
5
Accuracy
rating
5

Fairly easy to adjust to the velocity you want. Shoots pellet well stock and with some parts and tuning shoots slugs and pellets very well

Kind of wish fx would allow new ideas be tested more thoroughly before they would sell a product they dont have in stock yet. But they are cutting edge!

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Helpfull Review?
Overall rating
rating
5
Value for money
rating
5
Accuracy
rating
5

Really like having the compact version, its crazy maneuverable and of course very accurate. Came shooting 830fps but is easily tune able to what ever you need.

So far Im Good, no complaints. And thats After several tins of jsb and Fx pellets.

Great plinking fun, sweet paper punching, makes a great woods walking/ truck gun.

Add a Comment
Helpfull Review?
Overall rating
rating
5
Value for money
rating
4
Accuracy
rating
5

Accuracy; ergonomics, adaptability, quality. My first rifle was a Sheridan Blue Streak with a weaver peep site purchased at age 13 in 1964. Learned how to shoot with it and enjoyed countless hours shooting it. Shifted to powder burners for many years, but my bucket list always included an alum pic grade rifle. This was it. Accurate, compact, quality all the way.

Very little. The stock is a bit short, but after market extensions are available. Balance is good. Case is great. An extended quick release for the fill port would be nice.

Be careful. With the ability to switch to 700mm slug barrel, change calibers, add larger cylinders, etc. this rifle can become addictive. Check off one bucket list item.

Add a Comment
Helpfull Review?
Overall rating
rating
5
Value for money
rating
5
Accuracy
rating
5

a laser beam, I own 2 impacts that shoot heavy slugs and this compact does not disappoint, I put a slug liner in shooting 18gr jsb's at 940fps, 3/4" groups at 95yds, 100 bar, min hammer, line 3, i get 3 mags per fill, amazing!

Absolutely nothing

tuning is key with any impact, takes time and patience, but it's worth it

Add a Comment
Helpfull Review?
Overall rating
rating
5
Value for money
rating
5
Accuracy
rating
5

I think my other air guns are going to collect a lot of dust . I bought the compact 30 cal because it was the only one available. there is not one part of this gun i don't like. i put a donny fx on to make it quieter and i ordered a 600 mm barrel with a moderator. this is a very accurate gun . it is a bit much for squirrels but it stops woodchucks with one shot. I think i will buy a second one in 22 with a 600 mm barrel as soon as they are available.

i should have bought one sooner

try one you wont regret it

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