I’ve owned the Fx Tarantula for about 5 years in .22 and love it. It’s a very well constructed and accurate PCP rifle. One of the nice features, is that it does has an adjustable gas port whereby you can control the amount of power. Depending on the pellet in use, the range appears to be between 600-820 fps. I’ve got mine cranked out to the max. Since air rifles tend to ‘like’ certain pellet designs and weights at specific velocity, you can tune in to find the most accurate combination.
The only negative with this air rifle is it has a very loud gas valve report, as the pellets are traveling at sub-sonic velocity.