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Discussion Starter #1
Hello all. I have been a lurker on this forum for a while to catch up on what's what on the M&P pistols. I found that most everyone here seems pretty happy with their M&Ps, so I decided to get a M&P9c. The ergonomics of the gun are excellent and have fired 200 rounds so far without a hitch.



I have noticed what may be a design oversight/flaw with the trigger bar assembly. It looks to me that under extreme circumstances that should the trigger bar be allowed to move sideways toward the outside of the frame, the trigger bar will miss the sear and pass by the side of it, not firing the gun at all. This has never happened to me while actually firing the pistol, but it does have me concerned.



I will try to attach some pics here that I took of my pistol's trigger bar in both normal and abmormal positions.













 

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this is certainly not a design flaw. This is what keeps the gun from firing out of battery. If you look on the under side of the slide there is a small bump out on the track the trigger bar rides on, this bump moves the trigger bar off the sear if the slide is slightly to the rear. The ability to be moved out of the way is also what allows the mag disconnector to work without negatively impacting the trigger pull.



There is spring pressure on the trigger bar for a reason it it to keep it on the sear when it is supposed to be on the sear. This is a function of the trigger return spring. It will not slip off unless someone monkeys with the angles on the trigger bar or the sear.
 

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Thanks for the quick professional reply, Dan. I, too noticed the out of battery hump that you mentioned. The only spring tension that I noticed that seems to keep the trigger bar in its correct posistion is the trigger return spring all the way up by the trigger, as you stated.



I am fairly familiar with 1911 style pistols, but I am still learning myself on the ins and outs of this new M&P platform.
 

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if you had a gun with a magazine disconnect it would be more apparent how it all works. The shape of the trigger bar and the way it inserts into the trigger also helps keep it against the sear. Really the only way you could get a failure of the type you are concrened with is if you broke the trigger return spring, and even then if you pulled the trigger back into position it is likely it would reset and fire.



You know what, though, most guns if you break a trigger return spring you are hosed even a revolver.
 
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