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Picture of Ferrari Steve
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quote:
Originally posted by Elec540:
Sig Sauer In reference to Magazines:

Although there have been some demonstrated levels of functionality when using magazines and uppers of different generations, we recommend using like generation components for optimal reliability.

*Will I still be able to purchase Gen1 9mm Magazines?
Yes, it is Sig Sauer’s intention to provide support to MPX G1 customers for all components of the firearm. Magazines in other calibers will only be available as G2 magazines.

In reference to barrels/caliber X-change:

All customers will be able to take full advantage of the MPX Caliber-X-Change Kits. If you are an MPX G1 owner, Sig Sauer will offer you the opportunity to purchase a complete MPX G2 Upper Receiver in the caliber of your choice, other than 9mm, at a reduced cost that will be the equivalent retail cost of the corresponding MPX Caliber X-Change Kit. This is limited to one purchase per MPX serial number.

The Barrels from Gen1 and Gen2 MPX are different enough to not permit compatibility. However, with the purchase of your first “Caliber-X-Change kit you will receive a full Gen2 upper. If you wish to purchase other/future caliber kits they will fit the Gen2 upper only (as specified by product description). The Gen1 will remain 9mm. MPX Gen1 Cal-X Kits are being created in 9mm only. This allows the customer to purchase G1 barrel assemblies in 4.5-inch, 6.5-inch and 8-inch variations. 16-inch barrels will be available for G2 upper receivers only.

If you have any additional questions I will do my very best to answer. If I am unable to assist you directly or you require additional information regarding the SIG MPX, or any Sig Sauer products, please do not hesitate to contact Customer Service at 603-610-3000, Option 1, M - F 8:30am – 6:00pm EST


This sounds good... but with everything that's happened so far, I'm going to pretend I live in Missouri.

You know, because it's the "show me" state. Smile


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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Picture of corey4
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quote:
Originally posted by CRASH_PRO:
quote:
Originally posted by ctsheepdog:
quote:
Originally posted by Engineer:
I asked Liberty about 9mm performance and their response was:

"It is about 5 dB louder on 9mm. We are running in the lower 130s with it in 9mm on the host weapons we have here. The Mystic X runs in the upper 120's with the same weapon platforms."

I did not ask about backpressure but I assume it will be lower with the larger aperture and the monocore looks a lot less restrictive that the Mystic cores.

Thanks Eng. This is going to be tough to gauge until someone does a head-to-head, but it sounds like it will be a compromise between optimal muzzle sound and blowback.


It will most definitely have less back pressure, over bored and the baffle stack has a lot of space between baffles. I bet the FRP is insane. That's one area the Mystic X always suffered, but the same can be said for the Osprey.


the FRP on my 8" MPX with my osprey45 is negligible.
 
Posts: 130 | Location: Pittsburgh, PA | Registered: November 07, 2013Reply With QuoteReport This Post
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One way or another they have to follow through, and offer what they advertised. They had terrible timing when they brought out the new version. Should off held off till backorders got filled and innovatory caught up. The Trust level might have been little higher. Wait and See
 
Posts: 191 | Registered: April 06, 2014Reply With QuoteReport This Post
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On to triggers and a better aftermarket replacement...

SIG Customer Service (naturally) advises against this in the MPX. Having visited the SIG Pro Shop at the Academy in Exeter, they actually sell the Geissele line of triggers for other platforms. So it piqued my curiosity if they would recommend this product for the MPX too. They said NO! The 9mm MPX bolt carrier cycles too fast and hard, therby causing premature trigger pack failures in all of the aftermarket products they have tested to date. The MPX stock trigger has a beefier section to sustain the higher velocity forces.

Damn.

This message has been edited. Last edited by: armedjetflyer,


Robert Ioan
 
Posts: 68 | Location: USA | Registered: October 23, 2011Reply With QuoteReport This Post
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Picture of Ferrari Steve
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I've been thinking about asking Santa for an MPX Deployment bag, but the 5.11 Tactical Covert bags look just as good, and I have very good experience with their products (mostly clothing).

Anyone happen to know the internal dimensions of the MPX Deployment bag? Sig's website doesn't have any measurement info. Though I doubt it would fit the MPX with a suppressor attached.

With a SilencerCo Osprey 9 attached and telescoping stock closed, my MPX comes in at just under 27" total length.

For less $$$ than the Sig-specific bag, I could pick up this 5.11 COVRT M4 Shorty that handles up to 28.5" high inside:

http://amzn.to/1jxAgbJ

Anyone else carrying their MPX in something neat?


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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Picture of Ferrari Steve
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quote:
Originally posted by armedjetflyer:
On to triggers and a better aftermarket replacement...

SIG Customer Service (naturally) advises against this in the MPX. Having visited the SIG Pro Shop at the Academy in Exeter, they actually sell the Giessele line of triggers for other platforms. So it piqued my curiosity if they would recommend this product for the MPX too. They said NO! The 9mm MPX bolt carrier cycles too fast and hard, therby causing premature trigger pack failures in all of the aftermarket products they have tested to date. The MPX stock trigger has a beefier section to sustain the higher velocity forces.

Damn.
I'd like to see the failed Geissele trigger pack Sig tested.

Five months ago, Bill Geissele posted a comment on my article regarding MPX triggers (apologies in advance to anyone who thinks linking to ones own blog post is spammy):

http://www.stevejenkins.com/bl...-void-your-warranty/

Bill said "HK guns also have the bridge. High impulse guns will toss the hammer back violently so that the hammer will hit the disconnector. By repeatedly striking the disconnector it will actually fracture over time. As a trigger similar to the Sig the ALG trigger may have this problem. However, the Geissele triggers are designed so that the bridge is not needed and the hi velocity of the bolt carrier will not effect it. And even if there was a problem Geissele's golden warrenty is always there to help you out."

I've spoken to Bill since then and he stands by what he said five months ago.

I'm still running a Geissele SSA in my MPX and loving it. In fact, I picked up another SSA and an SSA-E on Black Friday.


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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Picture of Ferrari Steve
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And now for a TOTAL subject change...

Sig lists the overall length of the MPX with telescoping stock closed as 18.1" and barrel length as 6.5".

http://www.sigsauer.com/Catalo...Details/sig-mpx.aspx

As I'm sure others did, I relied on this info when I sent in my Form 1, well before the telescoping stocks were shipping.

My tape measure agrees with the barrel measurement, but with the stock flash hider removed, my tape measure claims that the overall length of an MPX with the telecoping stock closed as closer to 19.75".

I'd guess I'm not the only one with 18.1" on my MPX SBR Form 1. Is that worth attempting to amend?

Or is it not that big a deal, especially since the length on the form is shorter than what I measured as the actual length of the firearm?


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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The Sig Sauer deployment bag will only work if you have the folding stock on the 8" version or telescoping stock with the shorter barrel lengths. I know this because I tried it.
 
Posts: 159 | Location: WA State | Registered: December 07, 2006Reply With QuoteReport This Post
Thank you
Very little
Picture of HRK
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Picked up a MPX tonight




"My rule of life prescribed as an absolutely sacred rite smoking cigars and also the drinking of alcohol before, after and if need be during all meals and in the intervals between them." Winston Churchill
 
Posts: 10655 | Location: Mouseville, FL | Registered: November 07, 2008Reply With QuoteReport This Post
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Picture of Ferrari Steve
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Originally posted by tpd312:
The Sig Sauer deployment bag will only work if you have the folding stock on the 8" version or telescoping stock with the shorter barrel lengths. I know this because I tried it.


Thanks, tpd312. I've got the telescoping stock on the 6.5", so sounds like it MIGHT work if there's no suppressor installed.


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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When trying to get my Form 1 approved the person handling my case told me that it had to be an estimate with stock installed fully extended so that is the measurement I put down. That said, she said it would have been approved even if I left it the way it was. My real original issue was with the model designation.

quote:
Originally posted by Ferrari Steve:
And now for a TOTAL subject change...

Sig lists the overall length of the MPX with telescoping stock closed as 18.1" and barrel length as 6.5".

http://www.sigsauer.com/Catalo...Details/sig-mpx.aspx

As I'm sure others did, I relied on this info when I sent in my Form 1, well before the telescoping stocks were shipping.

My tape measure agrees with the barrel measurement, but with the stock flash hider removed, my tape measure claims that the overall length of an MPX with the telecoping stock closed as closer to 19.75".

I'd guess I'm not the only one with 18.1" on my MPX SBR Form 1. Is that worth attempting to amend?

Or is it not that big a deal, especially since the length on the form is shorter than what I measured as the actual length of the firearm?
 
Posts: 12 | Registered: July 04, 2015Reply With QuoteReport This Post
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When Sig listed the measurements, they went off the original 6.5" barrel length and not the 8".
 
Posts: 159 | Location: WA State | Registered: December 07, 2006Reply With QuoteReport This Post
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quote:
Originally posted by tpd312:
The Sig Sauer deployment bag will only work if you have the folding stock on the 8" version or telescoping stock with the shorter barrel lengths. I know this because I tried it.


I have the 8" barrel with an extended 3 lug adapter and telescoping Stock, mine fits in the deployment bag, granted not as easily as it did with the folding brace but it still does the trick. There is no way it would fit with suppressor but with the 3 lug it takes 2 seconds to pop it on.
 
Posts: 63 | Location: St. Louis | Registered: June 11, 2015Reply With QuoteReport This Post
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Picture of Ferrari Steve
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quote:
Originally posted by tpd312:
When Sig listed the measurements, they went off the original 6.5" barrel length and not the 8".


Yes. I have the 6.5" barrel. And the telescoping stock. And I measure 19.75" tip to tip (with flash hider removed).


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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Unless you cut your barrel from 8" to 6.5" is the only way you have one. There has been no release on short barrels. All the MPX's to this date have been 8" except for the Gen 2 16" carbine that just got released.
 
Posts: 159 | Location: WA State | Registered: December 07, 2006Reply With QuoteReport This Post
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Picture of Ferrari Steve
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quote:
Originally posted by tpd312:
Unless you cut your barrel from 8" to 6.5" is the only way you have one. There has been no release on short barrels. All the MPX's to this date have been 8" except for the Gen 2 16" carbine that just got released.


Ah. You're right. I just thew a tape from the muzzle to the upper, saw 6.5, and stopped thinking. The EXPOSED portion of the barrel is exactly 6.5", meaning the part of the barrel that's hiding inside the upper (and held in place with the screws) is exactly 1.5".

So my paperwork is REALLY wrong.

But I guess the good news is that I can cut my barrel down and still be legal. LOL


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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quote:
Originally posted by Ferrari Steve:
quote:
Originally posted by tpd312:
When Sig listed the measurements, they went off the original 6.5" barrel length and not the 8".


Yes. I have the 6.5" barrel. And the telescoping stock. And I measure 19.75" tip to tip (with flash hider removed).


My measurement with the telescoping stock came in just under 20". Below is a pic of the barrel tip which shows it's the 8".



In any case, fits nicely in the deployment bag. Just wish the essentials kit mag pouches I received had the velcro backing to use with the bag. The kit was still worth buying just for the mags alone.
 
Posts: 9 | Registered: May 19, 2015Reply With QuoteReport This Post
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Also, just wanted to say thank you, everyone. This group and thread has been so useful and informative in my thirst for mpx knowledge.
 
Posts: 9 | Registered: May 19, 2015Reply With QuoteReport This Post
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Has anybody else received the "new" charging handle? It looks like it is slightly beveled at the point of contact with the lower receiver. i have not had time to go to range yet to see what kind of damage or not it will do. I called SIG and they sent this one to me. It is not the ambidextrous one.
 
Posts: 13 | Registered: August 30, 2015Reply With QuoteReport This Post
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Picture of Ferrari Steve
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Originally posted by Hebrew Hammer:
Has anybody else received the "new" charging handle? It looks like it is slightly beveled at the point of contact with the lower receiver. i have not had time to go to range yet to see what kind of damage or not it will do. I called SIG and they sent this one to me. It is not the ambidextrous one.
I received it.

I put my calipers everywhere on it.

It's identical, except for the finish. The original ones were shiny. The "new" ones have the same matte finish as the MPX.

Otherwise... IDENTICAL.

I have no clue why Sig is wasting money sending them out. They are completely unchanged.


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Posts: 291 | Location: Seattle, WA | Registered: December 26, 2014Reply With QuoteReport This Post
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