Sig-Sauer MPX 9mm Pistol Opinions?

[Watchdog]

I know there's another thread on this forum about this, but there isn't much said in it.

There are several for sale at an LGS right now. So, I'll ask: Do any members have this pistol, with or without the arm brace? If so, what is your experience with it. Pros and cons?

If you have the pistol, what are you paying for extra (factory) magazines and what is your source for them?

What about ammunition...what's your choice?

Also, if you had your choice, would you prefer the MPX 9mm pistol, or would you go for the 5.56 pistol?

Thanks in advance for your replies/opinions.

 

[scooter123]

First off, I have NEVER understood the logic behind banning or limiting the use of a butt stock on a "handgun". Truth is that a short barrel will limit produced velocities and if you mount a butt stock on a handgun you still have a handgun and handgun velocities. I also don't think that a butt stock provides some Magical improvement in accuracy. The truth is that almost any practiced shooter using a reflex or similar sight will be more accurate shooting a handgun from a rested position than shooting a rifle from an offhand position.

As for the Sig MPX, I find it's a very interesting and innovative design. However, as a handgun, IMO it's appeal is only to those who want to look "tactical". Other than that it's pretty useless. Even with the arm brace holding it at arms length means you'll be moving around a lot, you'll still be getting pistol velocities, the sight radius is reduced compared to a rifle and you won't ever conceal this pistol in an IWB holster.

Personally if I were spending the kind of money these cost I would go for a version with a Carbine length barrel because the longer barrel will result in real gains in velocities and a much longer sight radius.

 

[bigwheelzip]

Was handling one with the forearm thing at Cabela's last week. Felt like the answer to a question few are asking. Nice machine though. I think a Bullpup, like the Tavor, gives more accurate, compact firepower in 5.56 or 9mm with the conversion kit if that's your flavor.

 

[Watchdog]

First off, I have NEVER understood the logic behind banning or limiting the use of a butt stock on a "handgun". Truth is that a short barrel will limit produced velocities and if you mount a butt stock on a handgun you still have a handgun and handgun velocities. I also don't think that a butt stock provides some Magical improvement in accuracy. The truth is that almost any practiced shooter using a reflex or similar sight will be more accurate shooting a handgun from a rested position than shooting a rifle from an offhand position.

As for the Sig MPX, I find it's a very interesting and innovative design. However, as a handgun, IMO it's appeal is only to those who want to look "tactical". Other than that it's pretty useless. Even with the arm brace holding it at arms length means you'll be moving around a lot, you'll still be getting pistol velocities, the sight radius is reduced compared to a rifle and you won't ever conceal this pistol in an IWB holster.

Personally if I were spending the kind of money these cost I would go for a version with a Carbine length barrel because the longer barrel will result in real gains in velocities and a much longer sight radius.

Thanks for your reply.

I have to admit, though, that I don't completely understand your points.

This Sig isn't meant to be a battlefield weapon, but rather a close-in gun. So it isn't advertised as being a carbine, it's a pistol.

The ones I'm looking at are the 8-inch barrel version.

So I have to ask...what's wrong with "handgun velocities" from an 8-inch barrel in close quarters, especially with a 30-round (or more) capability? If pistol velocities are good enough for home defense from a Shield or a Glock or a 1911, they should be good enough from this Sig, right?

Yes, they're pricey, I'll agree with you on that. And we're in agreement that a longer barrel/longer sight radius will produce better accuracy.

The Sig is just a concept that interests me right now. Thanks again for weighing in on the subject.

 

[Arik]

If I were to buy that or something similar it would be to SBR. Aside from these type of pistols are generally useless outside of range toys. They do look cool but shooting them is slower and more cumbersome and there is no advantage in the barrel length for a 9mm.

If I were to buy something like that it would be the Czech Scorpion EVO. First it's cheaper, around $800 +/-. Second it's actually a proven military firearm.

As a pistol

With the brace

As a carbine (note we will probably have the 16 in barrel version of course)

Having owned a rifle style pistol before I can tell you that their not very practical. Adding a sling can help somewhat with stabilizing but it's a half *** way. The sling must be held at tension at all times by pulling the firearm away from your body and it's still not as stable as a stock.

Pistol vs Rifle caliber -
The 223 relies on long barrel for optimal terminal performance. If I were going to short barrel rifles (and I do have them) I would stay with 7.62x39. That caliber relies less on barrel length. Going from 16 to 8 inches velocity drops only around 200 fps. And the bullet does not rely on barrel length for optimal performance.

Mine is on the left. 7.62x39. The other is 5.45x39.

If you want to spend the Sig money on a compact package in 5.56 I'd look at the Tavor.

 

[scooter123]

In a Home Defense role I can see the logic of that application. However Home Invasions typically happen at a pace and time most haven't really thought through. IMO the best choice for a Home Defense firearm is one that you can have strapped to your waist all day long. That way if you ever do need it all you have to do is Draw and Fire.

Yeah, I do know that today Home Invaders are trending to favor the AK47 and will admit a 40 caliber pistol is not an optimum choice when faced with a rifle. It's one reason why I also spend more time at the range shooting Handguns. Because when faced with superior weapons sometimes the best response is superior skills.

 

[68sixspeed]

As a folding stock SBR carbine I like it, kind of a modernized mp5. It would be sweet with a supressor. As a pistol is is not that appealing to me, but if you live where you can't get an sbr then the arm brace kind of gets you there legally. For now I live where we can't get it period,

 

[hardluk1]

I built my wife a 9mm AR pistol. To easy to build just what a person wants and do it for half the price of that sig mpx . My wifes has a brace on it and of course it will never be fired from the shoulder ! I pleased as heck with it and I used regular aero precision 5.56 upper and lower lower and a adaptor so converting to rifle cartridge is fast and easy to do . Added a primary arms md ads optic . Suppressor is in the works .

 

[WVSig]

I would not touch an MPX with a 10 ft Sig brace right now.

It is not that it is not an interesting or useless gun it is because Sig is using the buying public to beta test it. Give it a year or two before buying one because only then will "most" of the kinks be worked out and only then will you know if all the promised modularity and convertibility will actually happen.

The gun is already in Gen 2 production. Gen 1 mags will not work in Gen 2 guns. Gen 1 guns are not convertible to other calibers. Gen 2 mags work in Gen 1 guns in the real world depending on which rep at Sig you talk to they don't work. To make matters worse it is impossible to get Gen 1 or Gen 2 mags without waiting 60-90 days or paying scalper pricing.

This is the new Sig playbook. It happened with the rifle. It happened with the P250. It is happening with the Sig P320. MPX & MCX as I type. My advice is to wait it out. Give it 18-24 months and you have have a better idea of what you are really buying unless you want to be a beta tester.

 

[Arik]

I would not touch an MPX with a 10 ft Sig brace right now.

It is not that it is not an interesting or useless gun it is because Sig is using the buying public to beta test it. Give it a year or two before buying one because only then will "most" of the kinks be worked out and only then will you know if all the promised modularity and convertibility will actually happen.

The gun is already in Gen 2 production. Gen 1 mags will not work in Gen 2 guns. Gen 1 guns are not convertible to other calibers. Gen 2 mags work in Gen 1 guns in the real world depending on which rep at Sig you talk to they don't work. To make matters worse it is impossible to get Gen 1 or Gen 2 mags without waiting 60-90 days or paying scalper pricing.

This is the new Sig playbook. It happened with the rifle. It happened with the P250. It is happening with the Sig P320. MPX & MCX as I type. My advice is to wait it out. Give it 18-24 months and you have have a better idea of what you are really buying unless you want to be a beta tester.

This has been Sig's MOA for a while. Same thing happened 5 or 6 years back with the 55X series

 

[WVSig]

This has been Sig's MOA for a while. Same thing happened 5 or 6 years back with the 55X series

Yes I meant to put the 556 on the list. They promise all these features and then when the market does not buy them in mass they scrap them.

 

[g8rb8]

....these type of pistols are generally useless outside of range toys. They do look cool but .....

Having owned a rifle style pistol before I can tell you that their not very practical. Adding a sling can help somewhat ...... The sling must be held at tension at all times by pulling the firearm away from your body and it's still not as stable as a stock.
.......
.....I'd look at the Tavor.

Arik. Thanks for the feedback. Like you and watchdog I've been interested in these oversized pistols. Surprisingly Sig has the MPX-PSB listed in the rifle section in their website. Your real-life experience confirms some of the suspicions voiced that these are not so practical. They do look "cool" and look like they'd be a fun range or plinking firearm. They might arguably be a good self defense firearm for the home. I have experience with a bull-pup rifle (Aug) and, other than a slightly less convenient magazine reload, there is a lot of functionality in a small package (roughly the same overall length as one of these large pistols). Other users of these large pistols have told me there is a lot of muzzle flash from the 5.56 x 45. For home self defense I would guess the 9 mm might be more practical.

 

[Arik]

Arik. Thanks for the feedback. Like you and watchdog I've been interested in these oversized pistols. Surprisingly Sig has the MPX-PSB listed in the rifle section in their website. Your real-life experience confirms some of the suspicions voiced that these are not so practical. They do look "cool" and look like they'd be a fun range or plinking firearm. They might arguably be a good self defense firearm for the home. I have experience with a bull-pup rifle (Aug) and, other than a slightly less convenient magazine reload, there is a lot of functionality in a small package (roughly the same overall length as one of these large pistols). Other users of these large pistols have told me there is a lot of muzzle flash from the 5.56 x 45. For home self defense I would guess the 9 mm might be more practical.

There is a lot of flash from most rifle caliber pistols.

Here is mine without the flash suppressor

 

[Kanewpadle]

I shot one of these or something like it a couple years ago.

I found out that I'm not very accurate with a extremely large pistol or small rifle without a buttstock. But I admit, I am not used to shooting such guns and don't care for them even though I like the concept for plinking. Other than that I have no use for them.

I didn't care for the arm strap and would not want such a thing occupying my shooting hand/arm in a fight. If the gun is empty or malfunctions you then have to take the time to get it off you before you can grab another gun.

Other questions I asked myself about them is do you need night sights? Are they available? Red dot? Laser?

Right now I am content with a shotgun and several handguns for home. I am considering a Kel Tek Sub2000 9MM that uses Glock magazines because I have a bunch of them. The Sub folds of course but when unfolded is much easier to use.

The Sub 2000 is nowhere near the quality of the Sig. And then there is the price difference. But as usual the decision is yours.

 

[Mister X]

It's a relatively large and heavy weapon compared to a true handgun. It will be unwieldy and lack maneuverability compared to an actual pistol in the confined spaces and tight corners of a home. Overall ECQ and weapon retention capabilities will be severely compromised. You can't wear/carry it around the home. You can't conceal it for answering the door, taking out the trash etc. It's pretty much a two handed weapon. Firing one handed is possible, but not practical. They simply don't offer the advantages of a true handgun.

One in .223/5.56 would be EXTREMELY loud if fired indoors plus it still not practical as handgun and doesn't offer the advantages of a true rifle. A lot of guys get AR pistols for home defense, keep it without a round chambered with the plan of putting on ear protection and a sling. If there is that much lead time in a home invasion scenario, then an actual rifle would be infinitely better if someone feels they really need a rifle round.

 

[BAM-BAM]

I took a different route........

While the new crop of rifle caliber pistols look cool.....they don't seem to have a practical use...........and

extremely SBR (ESBR) are loud and have a lot of flash.....


I went to a Beretta CX4 in 9mm.......which
uses the same mags as my Beretta 92s (15-30 round factory and Mec-Gar magazines ).......

as a Personal Defense/home defense long arm.......

1. shorter than a AR with collapsed stock.....29 inches.
2.pulls more FPS out of the 9mm (1200-1300FPS)........
3.an extra 100 ft lbs of muzzle energy.((425-450 w/ standard vel. 124gr)
4. rapid fire fist size groups at 50-70yds........
5. little muzzle flash ......
6. Small Bushnell TRS-25 red dot.......and Streamlight weapons light....
7. can carry 2 spare magazines on the butt.

Small, light, handy home PDW.

 

[LVSteve]

Hi-Point 995 carbine for the win, except for the low capacity magazines.

 

[g8rb8]

.......
Here is mine without the flash suppressor

Looks about right for a crème brulee glazing torch. Chalk up one point for the "large pistols" or SBR's.