39xx - single stack compact
69xx - double stack compact
59xx - double stack full size
x9xx - 9mm
40xx - 40s&w
45xx - 45acp single stack
10xx - 10mm single stack
xx0x - standard size DA/SA standard slide mounted safety
xx1x - compact, DA/SA standard slide mounted safety
xx2x - standard size w/frame decocker
xx3x - compact w/ frame decocker
xx4x - standard size DAO
xx5x - compact DAO
xx6x - none standard size. DA/SA frame mounted safety
xx7x - none standard size w/ frame decocker
xx8x - none standard size, DAO
xxx3 - Aluminum frame/stainless slide
xxx4 - Aluminum frame/carbon slide
xxx5 - Carbon frame & slide
xxx6 - stainless frame & slide
For instance. A 5906 is a 9mm standard size double stack with a DA/SA action, frame miunted safety and made of stainless slide and frame.
A 5946 is the same but DAO.
A 4586 is a 45acp none standard size DAO made of stainless slide and frame.
A 4563 is a 45acp none standard size, with DA/SA action, slide mounted safety and has a Aluminum frame and stainless slide.
There are some variations though, but rarely.
Then there are the 3rd gen economy versions. These have some plastic parts such as sights and other minor parts.
910 - standard size, double stack 9mm w/10 round mag. Made for the 1994 awb
915 - full size, double stack, 9mm. 15 round mag. Same as the 910 but made prior to the 1994 awb.
908 - compact single stack 9mm
410 - same as 910 but in 40s&w
411 - same as 915 but in 40s&w and 11 round mag
457 - compact 45acp
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