With the release of the FX Impact M4, the Swedish manufacturer has not only left a lasting "Impact" on the airgun industry, they have also set a new standard for what a modern PCP Air Rifle should be. The Impact M4 features the Adjustable Match Precision MKII (AMP) regulator, external micro and macro hammer spring tension adjustment, and an external valve control adjustment. Together, these features represent a level of adjustability never before seen in the airgun world. While you may not need or want to alter these adjustments, the ability to test different settings and see their performance is at your fingertips. The adjustability doesn't stop there. The Impact M4 also utilizes the Smooth Twist X Superior barrel liner system that allows for the interchanging of calibers. Maybe more importantly, the system provides users the ability to purchase different liners made with different rifling twist rates specifically tailored to certain ammo. The possibilities are seemingly endless! And with the improved Power Plenum 750, the output performance adjustability is enhanced even more! This allows for a wider power adjustment range without sacrificing shot count. No detail was overlooked on the Impact. Shouldering the rifle highlights the ergonomic friendliness of the design. The new UG1 AR style grip and safety switch are a welcome set of features that will be comfortable for many shooters. The stock is capped off with a vertically adjustable rubber buttpad. Probably the most user friendly feature is the forward mounted reversible cocking lever that cycles the high capacity magazine with ease. Follow up shots will come at blistering speed, and the lightweight, quick set match grade adjustable trigger allows you to place shots with extreme precision. Carried over from the previous version is the rear Power Block. The power plenum stages the power capabilities of the FX Impact, and the rear block handles that transfer of power much like a car’s carburetor. The Power Block will be especially useful for those who desire to shoot heavy slugs. The pressure in the plenum can better translate to the pressure behind the slug upon firing, allowing higher speeds and power. Those shooting heavy slugs are encouraged to add the FX Impact Tungsten Hammer weight to also allow for higher working pressures. A welcome new addition to the M4 is the new rigid top plate and new scope rail system. The top plate is considerably thicker and stronger than it was on the M3, enhancing the shooting experience and performance. The top rail also has an 11mm dovetail machined into it that the longer Picatinny scope rail rides on. This allows the user to customize the rail's position to get just the right eye relief for their optic setup. You can even remove the Picatinny rail and mount directly onto the 11mm dovetail if you desire. FX has answered the call from shooters yet again, with a slew of enhancements that you’re sure to love. The M4 comes ready to do just about anything, from small and medium game hunting, to topping the field at a 100 yard benchrest match. The Swedish powerhouse raises the bar yet again, so pick one up today and unlock your shooting potential! Helpful resources: Learn about hunting with air rifles Tips for picking the right airgun for hunting game & pests Learn about airgun hunting laws in your state Shop related categories: pellet guns, pellet rifles