Our gen. 4 issues (same department as madisonsfinest) were with the stream light TLR family. Same as the gen. 3s- failures to feed, for which the gen. 4 was one of our solutions. Magazine springs, updating RSAs, etc. were all tried. We already issued 180 grain ammo, which some people thought was a partial solution a while back. Nothing was a 100% solution.
The administration's response (in conjunction with some of the armorers and instructors) was to dis-approve WMLS use with .40 cal Glocks. We also switched the initial purchase for the academy recruits back to the G17, and the bosses are working on getting a payroll deduction set up for officers who want to switch to a G17 or 19.
I had a gen. 3 G 22 for several years. I had very few problems with it up until summer of last year. I used Surefire lights, which may have helped a bit. I was also very meticulous with cleaning and parts replacement. When I couldn't keep the gun running reliably (I started getting 1-2 malfs per box of 50), I switched to an older Gen. 3 17. A week after qualifying, the next rounds I fired were on the street. I seriously think I dodged a bullet, so to speak. The recent volume of OISs in our area (3 in a calendar year is unheard of for us) when taken in light of the number of .40 Glocks and the number of problems we've had with them, prompted the department to take action.
Side note, partial rant. A lot of people will suggest simply switching platforms or going to an aftermarket solution. For shooters who aren't tied to department regulations, this is an easy solution. Keep in mind, though, than many of the people here who are seeing the G22/wml problem are either department end users, or instructors/armorers who are looking for a solution. Sometimes, using an aftermarket part (even a good one) is just going to be a no-go due to warranty or concerns from higher ups, warranted or not. Same with switching platforms. For many departments, issued or approved guns have logistical support behind them, and switching from .40 to 9 in the Glock still requires purchasing some specific parts, replacement guns, and ammo (it really isn't any easier for departments either). To an extent, it's a similar dynamic to the 1911 for a single person vs for an agency discussion going on elsewhere. What A) works and B) is acceptable, for 1 end user may not work for an officer beholden to policy/regs/someone else armoring their system, or for a firearms program.
I'm in the camp that if you have to fix the problem, going to a 9mm is the best option. However, it's not always an option.
The advice above is worth exactly what you paid for it.
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