Showing off my progress.

Widened the hitchhikers shoulder piece and lock belonging to the retractable stock assembly. It doesn't interfere with ejection so the ump can be fired from all positions. It's a little wobbly fully extended in it's current iteration. It's 27.5 inches extended with the muzzle device shown so it's not quite an SBR. I'm not finished yet but if there's enough interest I'll upload its current iteration on my od account after work. I plan on modifying the rails and lock to get more stability out of them fully extended.