FX Impact Slug Power Kit

No, it's not needed - the rifle will shoot as it is stock. The kit is for a .22 / .25 cal, I know there is a sleeve you can get for the .30 cal, but I don't think it will even fit a .35 considering a lot of the internals are different for the .35

They do have one that is made for the Maverick

I might be mistaken, but I think the power kit is only available for the .22 and .25. (The kit is made for .22 and there is a sleeve to make it work for the .25) My assumption is .177 has enough power to push whatever it needs, and .30 and .35 already have something to boost the power considering the pellets they use are require as much power as the slugs trying to be pushed out of the lower calibers

Bill, to begin, slugs require more air and at higher pressure than pellets, so generally speaking, you would be using more volume and pressure on the pellet than practically needed. Not that it would be detrimental, but a waste of air for shot count and excess pressure for precision, which might be so little that you might not notice it. For example, take the speed of sound once you break it the projectile gets wobbled and some, or all precision is lost, so you want to stay away from the speed of sound most definitely, or better yet below 80% Mach 1 to get the Best Power AND Precision combination. With the slug setting you might be at 79% Mach 1 which will outperform your rifle at any other settings, but under the same settings for the slug, you might drive the pellet at 81% Mach 1, or higher, which means it will fall below that "sweet-spot" Bell-Curve (in electronics, it's called the Maximum Power Theorem). So ask yourself, do you want more power, or better accuracy? There is a trade-off and that trade-off might not even be very noticeable, or even measurable to precision, but it is there, just do the math, which a whole book can be written on just one shot and all the variables involved such as what you had for breakfast, or not. The combination of the lighter K-value of the valve spring and the larger slug port can be as high as a 20% increase in air volume and air velocity at peak, so if you were to find the sweet-spot for your slug then you decide to shoot pellets, just crank down the power setting combination approximately 20% and you should be at the pellets sweet-spot, or in the area. The problems start with the ratios and proportions of the mass difference of the slug vs. the pellet then their coefficient of friction to the barrel then the ballistic coefficients then the Range then the wind speed and angle, but like I stated, you might not even notice it because a good shooter with a bad rifle will always out shoot a bad shooter with a good rifle; same pellets. In other words, you are the most influential variable in the myriad variables of the equation. I would just experiment and empirically find out because its about the journey and not the finish. Write down every data point on every shot and record video to be analyzed later with freeze frame capabilities, or don't even bother buying a rifle and just throw tins of pellets and tins of slugs and see how your arm hurts the least at the end of the day.

It should...

thats what the name implies

yes