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Middle children
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About 3 weeks ago the right side latch of my 2nd Gen MPX charging handle went flying down range, unrecoverable. I emailed Sig the picture and they say they sent me a new one but it shipped USPS without tracking. Roll Eyes

2 weeks later and the replacement still hadn't arrived. The gun was still functioning so I took it shooting again this weekend.

This time the left side latch failed as well. The MPX would chamber a round and then just click, it wasn't going all the way forward into battery. Upon closer inspection the left side roll pin had worked it's way loose, was getting hung up on the receiver, and was bent. The pin then broke and the left side latch fell off. That ended the day with the MPX as every time you pulled the trigger the charging handle now flew out towards your nose.

This time Sig sent me a new one via FedEx, hopefully I'll be back up and running this week. So check your charging handle to see if the roll pins are walking out, as they will cause the MPX to malfunction if they walk out far enough to contact the receiver.

I have about 1000 rounds through my MPX. Still no problems with the standard Geissele SSA trigger that I had purchased/installed while Geiselle was still saying they would work fine in the MPX.




I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious.

-Vince Lombardi
 
Posts: 2138 | Location: Ohio | Registered: September 06, 2008Reply With QuoteReport This Post
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quote:
Originally posted by Brett B:
So check your charging handle to see if the roll pins are walking out, as they will cause the MPX to malfunction if they walk out far enough to contact the receiver.


My charging handle on a January 2017 gun appears to have staked roll pins.
 
Posts: 4 | Registered: February 14, 2017Reply With QuoteReport This Post
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I called them when the left side wouldn't work. Got my replacement I 3weeks. Great customer service.
Tommy


NRA Lifer
AZCDL
A politician is a fellow who wants you to lay down your life for his country.
 
Posts: 29 | Registered: December 30, 2016Reply With QuoteReport This Post
Middle children
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The replacement charging handle arrived and it looks identical to the one that failed. There are no signs of the pins being staked on either of them. Guess I will have to keep an eye on the replacement too. The first one already gouged up the receiver pretty severely.











I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious.

-Vince Lombardi
 
Posts: 2138 | Location: Ohio | Registered: September 06, 2008Reply With QuoteReport This Post
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Should be easy to accomplish with an automatic center punch or even a finishing nail and hammer but I was never one for fancy gunsmithing.

This message has been edited. Last edited by: jmbrowning,
 
Posts: 4 | Registered: February 14, 2017Reply With QuoteReport This Post
Purveyor of Death
and Destruction
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quote:
It looks like Geisslle is out for a while


Why would Geisslle not work? Ive used CMC and now have a Franklin Binary trigger in it.
 
Posts: 6322 | Location: Raymore, Missouri | Registered: June 24, 2006Reply With QuoteReport This Post
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They used to say you could use their triggers in the MPX but changed and said they are coming out with a specific MPX trigger.

The problem is the hammer is hitting the disconnector which is why SIG has the bridge in place. Most disconnectors are a little too tall for the bridge to work. So some modify the bridge to use aftermarket triggers.

I just stuck a 3.5# JP hammer spring in mine. It's still a little gritty, but feels better.
 
Posts: 979 | Location: County 18, OH | Registered: April 11, 2007Reply With QuoteReport This Post
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quote:
Originally posted by Phelen_Kell:
They used to say you could use their triggers in the MPX but changed and said they are coming out with a specific MPX trigger.

The problem is the hammer is hitting the disconnector which is why SIG has the bridge in place. Most disconnectors are a little too tall for the bridge to work. So some modify the bridge to use aftermarket triggers.

I just stuck a 3.5# JP hammer spring in mine. It's still a little gritty, but feels better.


I bought a SSA trigger from the because they said they would warranty it. If it breaks...they will replace it. Hopefully they'll still replace it if anything happens. The SSA was a great improvement to the MPX trigger but it wasn't all that impressive to me. Now the webpage says their triggers are to be used from ARs only. MPX trigger coming out soon.

Thankfully with the popularity of the PCCs there will be a bit more in aftermarket support.


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Posts: 9655 | Registered: November 26, 2002Reply With QuoteReport This Post
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quote:
Originally posted by 45R:
quote:
Originally posted by Phelen_Kell:
They used to say you could use their triggers in the MPX but changed and said they are coming out with a specific MPX trigger.

The problem is the hammer is hitting the disconnector which is why SIG has the bridge in place. Most disconnectors are a little too tall for the bridge to work. So some modify the bridge to use aftermarket triggers.

I just stuck a 3.5# JP hammer spring in mine. It's still a little gritty, but feels better.


I bought a SSA trigger from them because they said they would warranty it. If it breaks...they will replace it. Hopefully they'll still replace it if anything happens. The SSA was a great improvement to the MPX trigger but it wasn't all that impressive to me. Now the webpage says their triggers are to be used from ARs only. MPX trigger coming out soon.

Thankfully with the popularity of the PCCs there will be a bit more in aftermarket support.


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Posts: 9655 | Registered: November 26, 2002Reply With QuoteReport This Post
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I have a Gen 1 MPX (SBR w/ Trijicon MRO) that I had the barrel cut down to 4.5" and have an Octane 45 can on it. It is perfectly accurate out to 75 meters until the barrel/can get hot (2 or 3 mags). Once it is hot it can't hit a man sized target at 20 feet. It is quite frustrating as this is one of my favorite guns. Is this a function of the suppressor?
 
Posts: 97 | Registered: November 17, 2015Reply With QuoteReport This Post
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I have a pair of MPX carbines I use in USPSA PCC. Between 2,000 and 3,000 rounds on each, there were ignition problems, and it turned out each broke the firing pin spring.

My understanding is Sig switched to a design without that firing pin spring, but now is back to using a spring.
 
Posts: 81 | Registered: September 19, 2013Reply With QuoteReport This Post
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TL;DR Franklin Armory Binary Trigger Gen 3 in MPX-P appears to hit 600 RPM intervals without hammer follow.

Put binary trigger in the MPX-P and put the timer on it at an indoor range. No hammer follow but hit the default max resolution of 0.1 second intervals. Forgot to hit RPM mode to get resolution down to the thousandth of a second. Probably wouldn't have workedv indoors anyway due to echo. Hope the short splits aren't artefact.

Will try to get max rate confirmation when I take the pistol outside.
 
Posts: 4 | Registered: February 14, 2017Reply With QuoteReport This Post
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quote:
Originally posted by 45R:
quote:
Originally posted by Phelen_Kell:
They used to say you could use their triggers in the MPX but changed and said they are coming out with a specific MPX trigger.

The problem is the hammer is hitting the disconnector which is why SIG has the bridge in place. Most disconnectors are a little too tall for the bridge to work. So some modify the bridge to use aftermarket triggers.

I just stuck a 3.5# JP hammer spring in mine. It's still a little gritty, but feels better.


I bought a SSA trigger from the because they said they would warranty it. If it breaks...they will replace it. Hopefully they'll still replace it if anything happens. The SSA was a great improvement to the MPX trigger but it wasn't all that impressive to me. Now the webpage says their triggers are to be used from ARs only. MPX trigger coming out soon.

Thankfully with the popularity of the PCCs there will be a bit more in aftermarket support.


I, too, bought an SSA when they said it was supported. Around 4500 rounds I was getting some double fires. I called Geissele and they said they would provide a one time warranty repair for no charge, and warned me not to put it back in the mpx. If I did, the next time it fails it will cost around $180 for repair work. Hope this helps....I am thinking of just doing a trigger job and springs and calling it good.
 
Posts: 15 | Registered: December 22, 2015Reply With QuoteReport This Post
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You could try a Hiperfire trigger instead.

Already has a bridge as part of the design, and a better trigger pull to boot.

CK Bush
 
Posts: 11 | Location: Arizona | Registered: June 05, 2015Reply With QuoteReport This Post
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So called Sig customer service to check on my MPX K handguard I ordered Feb 2016, they said approximate ship date is July. At least my Omega 9K is about to clear! Can't believe it's taking so long for a part...
 
Posts: 23 | Registered: March 08, 2016Reply With QuoteReport This Post
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quote:
Originally posted by ckbush:
You could try a Hiperfire trigger instead.

Already has a bridge as part of the design, and a better trigger pull to boot.

CK Bush


That's a good idea. I've been looking into them since you posted this. I would be interested in hearing from someone who has had over 4500 rounds through it to see if they had any issues as that seams to be where the decent aftermarket triggers start failing.

Update: I purchased the hiperfire 24c after I received an email from the company stating it will work with no issues.

This message has been edited. Last edited by: mpxgeek,
 
Posts: 15 | Registered: December 22, 2015Reply With QuoteReport This Post
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Originally posted by g8rbreath:
So called Sig customer service to check on my MPX K handguard I ordered Feb 2016, they said approximate ship date is July. At least my Omega 9K is about to clear! Can't believe it's taking so long for a part...

Yeah, pretty unimpressed. I'm still waiting on the one I ordered in January of 2016 as well.

...I almost sent Sig CS a "Happy 1st Anniversary" card, signed by my order number! Didn't want to get tossed to the bottom of the line though, ha!
 
Posts: 133 | Location: MN | Registered: January 07, 2016Reply With QuoteReport This Post
Middle children
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Finally SBR’d!

Here is the mod list:
Trijicon MRO
Scalarworks co-witness MRO mount
Silencerco ASR 9mm flash hider
Silencerco Hybrid suppressor w/ASR mount & 9mm endcap
Sig KeyMod front hand stop
BCM KAG KeyMod rear hand stop
Geissele SSA trigger (purchased when they still supported it for MPX)
Magpul MOE-K2+ grip
Factory Sig telescoping stock
Engraved by Tarheel State Firearms (excellent work and turnaround time)







I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious.

-Vince Lombardi
 
Posts: 2138 | Location: Ohio | Registered: September 06, 2008Reply With QuoteReport This Post
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Picture of Smokey99
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quote:
Originally posted by mpxgeek:
quote:
Originally posted by ckbush:
You could try a Hiperfire trigger instead.

Already has a bridge as part of the design, and a better trigger pull to boot.

CK Bush


That's a good idea. I've been looking into them since you posted this. I would be interested in hearing from someone who has had over 4500 rounds through it to see if they had any issues as that seams to be where the decent aftermarket triggers start failing.

Update: I purchased the hiperfire 24c after I received an email from the company stating it will work with no issues.


I've got about 2000 with Hyperfire 24C. It's off the chain!!!


"Son, always take your paper to the woods" - my dad
NRA Endowment Life Member
3 Gun, PCC, IDPA, Bullseye Shooter
 
Posts: 304 | Location: Upstate SC | Registered: October 11, 2010Reply With QuoteReport This Post
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Picture of Smokey99
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Originally posted by 10x Sniper:
I just saw that LuLa now has a MPX magazine loader available. Anyone feedback and what else is out there to assist loading these mags?


Works great! A six year old could load the mags - effortless!


"Son, always take your paper to the woods" - my dad
NRA Endowment Life Member
3 Gun, PCC, IDPA, Bullseye Shooter
 
Posts: 304 | Location: Upstate SC | Registered: October 11, 2010Reply With QuoteReport This Post
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