Make sure the pistol is clean and well lubed...they don't like to be shot dry or right out of the box. They also need several hundred rounds of break-in and are definitely ammo sensitive....funny thing is, some like one kind, others like other types. Find what yours likes and pamper it with those (if you can get it). Gold Dots are probably the best, but some like silvertips, mine shoots Lawman OK for range work, and some like Golden Sabres (others apparently don't!). Like a trophy wife, this pistol doesn't like to be fed cheap stuff. You definitely need the mag extension...any tendency to limp-wrist this pistol will result in a jam.
John