Just purchased the new Q5SF,also have the Q5 poly, XDM osp,and CZ Shawdow 2 Finally a striker fire steel frame gun. This gun shoots just as good as the CZ Shawdow 2 (maybe better)and its not a DA/SA!!!. Got a Leupold DPP 2.5 optic(best for competition use)also have trijicon RMR, and Vortex Venom, 2.5 moa dot never leaves viewing window under recoil. Even when my wife shoots it ,she can control it much better than any other 9mm she has shot. (which means I got to buy another one). I have been able to use all of my existing accessories from the Q5poly, my Boss holster(heat up bottom of holster where extended rail dust cover is, push gun in, let cool,perfect fit),Sprinco trigger spring kit works, Sprinco recoil management system works( make hole in end of guide rod bigger(1/8) for tab on break down lever to fit in). Have shot 9 different kinds of ammo, 115gr,124gr,147gr and 150gr all worked flawlessly. Best group at 25yds was Atlanta Arms JHP, 3 shots all in a 1/2 in a circle, best competition load Federal Syntec 150 ,1 5/8in circle. This was shot from a gun vise to remove human area. Have read about people having trigger safety hanging up (which is not having middle of finger pad on trigger)but to help with this just put a rubber band around trigger to hold safety latch against trigger over night for a week(removes some of spring tension). Also if it stove pipes its most likely poor gun control.If you loose site of dot when shooting you are not holding your support hand tight enough. If any other questions I might be able to answer, i will try,going to shot again today. Have shot this gun 8 days in the last 2 weeks and it still amazes me!!!