I finished designing and 3d printing a suppressor for my Umarex Gauntlet .22. There are 2 versions but I found that it works much better without the factory baffle and spring moderator. The version 2 uses a longer end with o-ring to aid in bore alignment. I recommend version 2 since I got a baffle strike with a version 1 (photo attached).
https://www.thingiverse.com/thing:4642777
* This is intended for airgun use only and has threads that only fit a Umarex Gauntlet
https://www.thingiverse.com/thing:4642777
* This is intended for airgun use only and has threads that only fit a Umarex Gauntlet