Shopping for an aftermarket trigger for Glock® can be an overwhelming task, especially if you don't know where to start. In order to narrow things down, you should ask yourself a simple question:
"Why do I want to replace my existing trigger?"
The answers to this question will begin to form a picture of the trigger you are looking for as a replacement. As you filter your options, there are 5 things that you should consider.
Are the triggers on your list of options safe? The trigger safety, striker (firing pin) safety, and the drop safety functions should all be left intact in order for your Glock® to remain as safe and reliable as the day you bought it. This would require reading reviews (knowing that reviews are inherently subjective), searching for reports of malfunctions with particular triggers, and determining whether or not a particular manufacturer makes safety a priority in the design of their products. Understanding exactly how the safety systems in a Glock® operate will go a long way in helping you determine whether a particular trigger should even be on your list.
2) Quality and Reliability
Once you've narrowed your list down to a set of safe options, it's time to take a look at build quality and how well they will stand up to abuse, variable conditions, and the test of time. You can ask questions related to material choices (polymer, aluminum, steel, copper, titanium...), types of trigger bar and trigger safety pivot pins (solid, spring coil, roll, threaded...), and types of trigger bars (Glock® factory, modified factory, aftermarket).
After your list has been reduced to a solid set of safe and reliable options, it's time to get personal. The purpose of the trigger and the particular gun will help in this area. Is the gun meant for competition, duty, self-defense/carry; or is she simply a range queen? The pre-travel reduction (length of the trigger pull before the "wall"), shoe profile or shape (curved, flat, hybrid), edge breaks (do sharper corners irritate your digit?), and surface finish (gloss, matte, textured...) will vary between manufacturers. The application for the trigger along with your personal physical characteristics (overall size and "meatiness" of your mitt, length of your digits, height of your grip) will contribute to whether a particular trigger works for you or not.
This is perhaps the most subjective element of them all. Which trigger out of your ever-shrinking list catches your eye the most? We can't really help anyone make this decision, so you do you. Go with what you feel.
Perhaps the first thing that comes to mind, the price of a trigger actually says very little. The price tag may reflect the quality of a trigger to a limited extent, and it may certainly correlate to the material used in its construction. In some cases, included components and extras can also affect price. Beyond that, the price is related to brand name, desired profit margin of a particular manufacturer, and supply and demand. The most expensive triggers are not necessarily the best, and the cheapest triggers may not be the worst...for you. You will simply have to prioritize your own needs (and wants) and decide how much you're willing to spend.
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