We have received questions regarding whether our Gunfighter Trigger defeats the “drop safety” in Glocks. Allow the following to explain that it does not:


As to the claim regarding the drop safety, there are a few things to understand. As many are aware, Glock has engineered three safeties into its pistol: (1) the trigger safety; (2) the firing pin safety; and (3) the drop safety.


1. Trigger Safety. The trigger safety is incorporated into the trigger in the form of a lever and when in the forward position, blocks the trigger from moving rearward. To fire the pistol, the trigger safety and the trigger itself, must be deliberately depressed at the same time. If the trigger safety is not depressed, the trigger will not move rearwards and allow the pistol to fire.


2. Firing Pin Safety. The spring-loaded firing pin safety projects into the firing pin channel and mechanically blocks the firing pin from moving forward. When the trigger is being moved rearwards, a vertical extension of the trigger bar pushes the firing pin safety upwards, clearing the firing pin channel. During the slide cycling process, the firing pin safety automatically reengages.


3. Drop Safety. The rear part of the trigger bar, which has a cruciform shape, rests with both arms on the drop safety shelf located in the trigger mechanism housing. When the trigger is pulled to the rear, the trigger bar begins to move down off the shelf until finally separating from the firing pin lug. During the slide cycling process, the trigger bar is lifted and caught by the firing pin lug. The trigger bar is reengaged by the firing pin lug.


The language above is taken directly from the official Glock website (emphasis added). As to the first safety (the trigger safety), you will note that if the trigger safety is not depressed, the trigger/bar CANNOT move rearwards. This is critical to defeating the remaining two safeties, thereby firing the pistol.


The rearward movement of the trigger defeats the second safety (the firing pin safety). The "bird's head" of the trigger bar, moving rearward, allows the safety plunger to drop. The dropped safety plunger opens the channel for the firing pin/striker to move forward.


Finally, the third safety (the "drop safety") requires that the trigger bar move rearward (allowed by the first safety), dropping it down so that the firing pin/striker can move forward past the safety plunger (dropped due to the second safety), thereby striking the primer and igniting the cartridge.


As you can see from the above, ALL three Glock safeties MUST be defeated in order for a properly functioning pistol to fire. This triple safety redundancy ensures that if one or even two safeties are defeated, the pistol still CANNOT fire.


Assuming arguendo that the Deus Ex Machina Gunfighter Trigger somehow defeats the "drop safety," there are still TWO other safeties intact (firing pin and trigger). The trigger bar would still need to move rearward to allow the "bird's head" of the trigger bar to move out of the way of safety plunger, opening up the channel for the striker to move forward. Thus, in dropping the gun, the trigger would have to move rearward (thus disengaging the trigger safety). As you can see, this appears to be highly improbable given normal operating conditions.


Moreover, alterations to other factory components, aftermarket parts (e.g., titanium plungers, wrong caliber plungers, etc.), or wear/damage can negate the safeties, possibly causing them to not function properly. Knowing the condition and type of components in a pistol would be critical to determining what may be contributing to the issue.


Also, the drop testing occurring, while commendable, is in no way a reflection on reality or any known standardized procedures. By way of example, no one will likely throw his/her gun 15 consecutive times in a gunfight (and I've asked my partners who've been in multiple gunfights).





We strongly believe that any failure of the Glock drop safety CANNOT be caused by a “flat trigger,” but rather is the result of out-of-spec engagement with the striker pedestal and the rear of the trigger bar/crucifix. Our own testing and evaluation of aftermarket triggers (ours and others) as well as a factory Glock trigger have confirmed our theory. Glock’s factory spec for this type of engagement calls for 66% to 100% of the striker pedestal covering the crucifix. Below is a graphic representation of both the proper (#106 and #10&) and out-of-spec engagement (#108):


As you can see above (#108), when the striker pedestal does not have enough surface engagement with the rear of the crucifix, disengaging the striker requires little movement. The “wings” of the crucifix rest on shelves in the frame and guide the trigger bar/crucifix down when the trigger is depressed, thereby releasing the striker. If you remove your slide, you can also see that there is some up/down play in the trigger bar if you use your finger and press on the bar.


An object, when dropped, has force exerted on it pursuant to Newton’s Third Law of Motion (for every action there is an equal and opposite reaction). If you watch a ball dropped from a significant height in slow motion, you will see the force affecting it by the ball flattening out to some extent. The same occurs with a pistol of course; especially a polymer framed one that has more inherent flexibility. The minor change in shape a Glock may undergo when dropped/thrown, coupled with the play in the crucifix in the frame, further coupled with the out-of-spec striker pedestal engagement with the crucifix CAN lead to the trigger bar bouncing under the striker, thus releasing it (we have proven this in our own testing). Additionally, some aftermarket parts, especially connectors, can also contribute to this issue.


However, assuming this occurs, the safety plunger should still engage, thereby preventing the striker from moving fully into the chamber, igniting the primer. If there is damage to the plunger, an aftermarket plunger is used (titanium plungers and some other aftermarket plungers are notoriously soft, far below the factory Rockwell rating of 50), the incorrect plunger is used (some people use a .40 in a 9mm), or there is damage to the striker itself, this safety MAY fail, resulting in a potential discharge. This is why maintaining your firearms is critical to its safe operation. We have found that our Glock Gunfighter Trigger works best with factory OEM parts, or aftermarket parts that maintain the appropriate factory tolerances.


We have taken the time to engineer a superior Glock trigger, all the while maintaining Glock's safeties, ALL of them. And I don't throw around the word "engineer" with reckless abandon. We have worked closely with a very skilled and experienced engineer who has manufactured tens of thousands of aftermarket Glock triggers already through his manufacturing company (in addition to extensive aerospace, medical, and other tolerance-intensive industries) and we are know our product is completely safe.


Needless to say we have the utmost confidence in the quality and design of our product and will put it up against ANY other comparable trigger on the market. As explained above, we know that our trigger will not defeat the "drop safety" or any of the other factory Glock safeties. The issue here is out-of-spec trigger bar engagement with the striker.


In conclusion, while I understand that some may have doubts, there is no way that the Gunfighter Trigger defeats the drop safety nor would that alone necessarily induce a discharge of the pistol without the TWO other safeties also being defeated. capegoating “flat triggers” as unsafe is false and reeks of ignorance about the underlying issue.


At this time we consider the matter closed, as the trigger clearly is not the cause of any malfunction, especially the drop safety. Adjusting the rear crucifix up, to fully engage the striker pedestal, appears to resolve the issue (per our testing).


Thank you.


Deus Ex Machina Ltd.


The above file is available as a PDF: HERE