I a friend from work looking to get into action shooting. All he has now are bolt guns. We are going to the range this weekend to shoot my glocks, and CZ85B as well as my son's Shadow Target (That will ruin him for anything else). On a budget, this looks like a great option. Do these work with SP-01 holsters? What aftermarket sights work on these? As much as I love my K2 45, I will never again buy a pistol that doesn't have night sights or FO sights available for it.