I recently acquired a Hellcat and really enjoy shooting this gun but I do have one problem.  When I draw and fire this one handed my thumb rests above the mag release and about 1 out of 20 times when I fire multiple rounds the mag will release.  A few times it has fallen to the floor.  Which would be really embarrassing if I were facing an actual threat.  This does not happen when I am shooting 2 handed.  Has anyone else had this issue and does anyone know where I can buy an aftermarket mag spring with a little more tension?