Caliburn B Variant V2 K31 Spring Rest

I set up my B variant v2 with a K25 that was hitting at 285 fps with a 24-inch .511 barrel. I had a K31 lying around, so I made this. With a 16-inch .527 barrel, I hit about 130 with short darts and 120 on full lengths. With my original 24-inch .511 barrel, it was pretty inconsistent, ranging from 100 to 135 fps. 

Also, my K31 spring was 11.5 inches long, so I modeled this part around that length. Because of that it may or may not work well for you depending on how long your spring is.

Made a spring rest compatible with a K31 for lower fps