FTF's (not Gun related) Look at:

#1 Magazine profile, quality ( some need to be broken in)

#2 Ammo

#3 Dirt

#4 Limp wristing



FTF's (gun related) [after break end] Look at:

#1 Ramp

#2 Chamber Opening ( a lot of jambs are at the top of the opening [magazine influence combined with also])

#3 Rough breech face

#4 Extractor clearance (while your at it, look at the hook profile)

#5 Spring balanced with load

#6 slide velocity ( part of gun balancing)

Then it gets down to quality, metal burs, individual parts, etc.

Gun Shows are almost as comical as boat ramps in the Spring.