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Old 07-19-2013, 06:14 PM
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Default How the M&P trigger works

Recently there have been a few questions concerning the trigger. I looked on YouTube and found no videos showing how the gun works. So, I made this video showing how the trigger works.

The volume is too low in my opinion and there is a spot where the slide is a little out of focus. Still, I hope y'all find it useful.

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Old 07-19-2013, 07:20 PM
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Fantastic, simple and to the point. Well done sir!

With my laptop, I have to use ear buds, so the sound was perfect.
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Old 07-19-2013, 08:32 PM
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Excellent video. Thanks again for sharing your knowledge !
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Old 07-19-2013, 08:37 PM
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Nice video.The volume was fine.
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Old 07-19-2013, 11:21 PM
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Great video!!! Love Rush too
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Old 07-19-2013, 11:37 PM
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Nice video, thanks.
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Old 07-20-2013, 12:24 AM
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Originally Posted by Justin69 View Post
Great video!!! Love Rush too
I didn't think anyone would notice. I am a big Rush fan. It's the first time I've tried to add music to a video.
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Old 07-20-2013, 01:46 AM
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Really good video. Thanks for sharing.
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Old 07-20-2013, 03:05 AM
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Great job.
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Old 07-20-2013, 07:14 AM
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Thanks for producing the video & posting it for us to see. Good job!
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Old 07-20-2013, 01:20 PM
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There is a secondary reason that the bump in the slide causes the trigger bar to disengage the sear loop from the sear. Not only does this allow the sear to raise up, to catch the striker (cocking the striker), but it allows the gun to function as designed, as a semi-automatic action. The trigger must be released, to allow the sear loop to reset under the sear. After the reset, the trigger must be pulled again to allow the gun to fire. Without this disengaging of the sear, it is possible the gun could become full auto. The gun could continue to fire as long as the trigger is pulled. It is not a certainty that full auto would be the result. It could allow an even more dangerous situation, as it could allow the cartridge to fire before being fully seated in the chamber.

Even though the striker is retracted from the bolt face, by the striker spring, after firing, it is possibly that the striker could move forward and strike the primer, upon the slide slamming the cartridge into the chamber. This would be more likely with "soft primer" ammunition.

Full auto is possible if the striker is not retained by the sear, and the trigger remains in the rearward position (bypassing the striker safety/blocker). When the forward movement of the slide pushes the next new cartridge into the chamber, and then the slide slams closed, the forward inertia could cause the striker to move forward and strike the primer. If it strikes the primer hard enough, it would fire, and would continue to fire, until the trigger is released or the ammunition is exhausted.

This is a possibility. Would this happen? There are many variables that would have to be just right, to allow this to occur. What I have described is not how a full auto gun is designed. The full auto gun allows the action of the gun to close/lock, and the striker/hammer is fully cocked. Just as the action closes, an arm/lever (auto sear) then releases the striker/hammer. The gun continues to fire as long as the trigger is pulled or the ammunition is exhausted.

I have a SlideFire stock on my AR10. It works almost exactly as a full auto gun, except there is no auto sear. The sliding stock allows the trigger to move back (recoil) and forward (pushing forward on the handguard) into a stationary trigger finger, which acts like the auto sear. I put a compensator on it, to keep the barrel down, and tame the recoil. Lots of fun shooting, but very expensive. I don't auto fire often, or for long periods of time. Even though my AR has a heavy barrel, it gets very hot, after firing only one full mag (20 rounds of .308/7.62). I don't want to warp my barrel.

Bob

Last edited by robkarrob; 07-20-2013 at 07:04 PM.
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Old 07-20-2013, 01:58 PM
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Excellent video, straight to the point, informative, well lighted, clear and concise, and detailed. This video is in the top 10% of all videos on youtube.

Please keep in mind, if anyone knows how to make a gun fully automatic, please don't share that information!! I believe it is a felony... I could be wrong, but it wouldn't be wise to post how to make a gun go auto....

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Old 07-20-2013, 02:30 PM
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It is not illegal to tell/show how to do it. It is illegal to do it. There are many videos and instructions, on the internet, showing how to do it, and how they operate. I've seen exact instructions and dimensions as to how to make an auto sear.

The laws are so tough that it is against the law to have possession of an unregistered auto sear, and also a gun capable of using that auto sear. It doesn't have to be installed, just having it and a gun that can use it, could put you in jail for 10 years. The Feds.

Bob
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Old 07-20-2013, 03:07 PM
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Excellent. Thank you very much!
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Old 07-20-2013, 03:16 PM
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Appeciate your taking the time to make and post the video. Great job providing explanation on how striker fire works on the M&P.
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Old 07-20-2013, 05:52 PM
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Thanks for the vid
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Old 07-20-2013, 07:36 PM
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Nicely done!
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Old 07-20-2013, 09:57 PM
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Quote:
Originally Posted by bobermo View Post
I'd like to learn more about the difference between M&P and Glock trigger mechanisms. Supposedly, the Glock striker is only half cocked and then fully cocked by the trigger, not the slide.
This is another reason I made this vid. An acquaintance made the comment that the M&P was a copy of the Glock. Nothing could be further from the truth.

While the Glock is equally simple, the only thing they have in common is the striker. The trigger bar, sear and how they work is different. It's more difficult to demonstrate and I don't have a Glock anymore so, I can't make a video of it.

Quote:
Originally Posted by bobermo View Post
Also, the FMK 9C1 supposedly has a true DA striker fire system. This sounds interesting. Wonder how that works.
I'm not familiar with this gun, sorry.

As far as the full auto thing is concerned, I guess it could happen. There might be enough momentum from the slide to fire the next round automatically. That is indeed probably part of the design. I'm not convinced it would work though and I certainly won't tell anyone that it would.

Further, it would be a stupid idea in a gun like this. In full auto the mag would be empty in less than 2 seconds and it would be almost uncontrollable. Completely useless.
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