This took an otherwise stock Longshot to about 100-110 fps. That’s not that spicy nowadays, but it’s a big jump from the stock performance.
I really appreciate the inclusion of the the silicone pad. In addition to providing extra cushioning for the plunger head, it also fills in the dead space in the bolt. That’s something you’re going to want to do, anyways, so it’s nice to have it included here.