Severe jamming with Hipoint "Yeet Cannon" Gen 1 threaded barrel model 

Tula: malfunctions every shot
Standard power brass FMJ and defensive loads (PMC, Blazer, Winchester): jams every 2-3 shots
M1152 NATO: jams every 2 shots
subsonic 147 grain (Speer Clean?): malfunctions every 4-5 shots
This is with the Rugged Obsidian 45, with the 1/2x28 piston and fixed barrel spacer. Gun will go back to Hipoint as soon as I can reach their customer service.