Gen 2 Glock 19

Lots of Glockers out there consider the Gen 2 Glock 19 to be the "perfect Glock" and I would have a hard time arguing that point.   In the last few years, these Gen2 guns have been flooding the surplus market as departments upgrade their guns to the newer Gen4 models.   The good news for the public is that while most of these guns were carried a lot and show some wear, many  were shot very little over their lifetime and have plenty of life left in them.

Pros: 
-Reliable.  The gun has had 0 malfunctions
-Accurate (more accurate than I am) 
-Durable.   There are many, many of these guns with documented round counts over 25k that have only had simple spring replacements in that time
-Easy to maintain 
-TONS of aftermarket support 
-Accepts 15, 17, and 33 round factory magazines 
-Small and light enough for most to carry but holds 15+1 
-Glock's customer service is second to none 
-Durable finish
-Cheap replacement parts, should you ever need them 
-Low Bore Axis resulting in a relatively soft shooting gun
-Easily modified to fit the shooters' preferences
-Requires very little cleaning/lubrication to run reliably 
-Many people prefer the Gen2 grip without the finger grooves present on the Gen3/4 guns
-Many of the worries about brass to the face are assuaged since these models were never known to happen with the older guns.

Cons: 
-I'm not a fan of the Glock factory plastic sights
-Comes with a serrated trigger due to import rules (easy swap)-I prefer the Gen3/4 finish to the Gen2 finish
-When I first inspected the gun, I noticed the slide stop lever had almost no spring tension and replaced it.  What I'm getting at there is that you'll certainly want to inspect the guns because some departments out there do very little armoror work (if any at all) on their guns.

Here's a video with some shooting from the 12m line,  break down the gun, do a size comparison, go over the "6 part upgrade," and do a chronograph test with some popular carry/defensive loads:

Chrono numbers:

Federal 124gr HST: 1132fps, 353 ft/lbs energy
Speer 124gr Gold Dot: 1145fps, 361 ft/lbs energy