Top one is an original M2 body (back when the M2 was actually what is now a C2), with Z58 Clickie and original KL5 bezel. Note that I consider the KL3 and KL5 to be basically the same shape/size.
Next is a C2-BK with an old-style black M2 bezel (current M2 bezel has been on a diet)
Next is an E2e (SHOT Show 2003 special edition)
And last we have an original L4 which I believe in the photo is an E2e body with KL4 bezel and Z57 Clickie.
Fred,
No, the L2 features the L2 bezel, and the L4 features the KL4 bezel.
The L2 bezel is shorter than the KL4 because the electronics of the L2 are located in the body rather than in the bezel like the KL4.