The Sig Sauer MPX was to be an updated version of the MP5. Side by side you can see how similar they really are. They even kept the name similar to the MP5 but simply nixed the 5 for an X. Both chambered in 9mm. The MPX is a pistol with an adjustable Sig Brace to mimic the collapsing stock of the MP5. The Sig MPX differs though in its piston driven action vs the roller delayed block back operation of the MP5. Sig went with an AR-15 style configuration so it has an AR15 style charging handle. That is one of the weak point of the MPX and where the MP5 shines even though it is decades older. Forward charging handles are easier and faster to manipulate than the AR style charging handle. Recoil on the MPX is astoundingly minimal and both suppress very well.

With the recent explosion in popularity of pistol caliber carbines, something Nathan F. has expressed dislike over, there are many options of MP5 clones if that is what you desire. The MPX can be purchased for just a little less especially if you shop around you can occasionally find them for a great deal.



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  • Giolli Joker

    I’m going the Alex C. route on this one.

  • SGT Fish

    while forward charging handles are nice. they can get in the way and cause trouble if you need that space for accessories. they also leave a big slot for dirt and debris to get in. I do like the charging handles on the left side of the receiver, but they suffer the same problem of leaving an opening for dirt. And can even cause optic mounts to get in the way when you are charging the gun. Too many people bash the AR style handle design, but it has a lot of genius to it, especially with a raptor handle installed or one of those new latch-less ones

    • Beju

      I’ve heard it said that the AR style charging handle is ‘the best when you don’t need it, and the worst when you do need it.’

      Fortunately, you don’t need to use it all that often

    • 8166PC1

      I never heard of debris getting in as a con against forward charging handles. The Galil Ace,FNC, and SCAR all get around it.

    • Amplified Heat

      If you are familiar with the layout of the HK receiver, the dirt ingress path there isn’t much of an issue; there’s nothing going on inside that tube but a loose cocking handle. Each time the gun fires, blowby also poots any loose debris out of the gun (into the shooter’s face/clothing)

  • Holdfast_II

    The MP5 may suppress effectively, but with the blow-back system, it spurts a lot of gas and crap into the shooter’s face when suppressed. So that’s not “well”.

    • SGT Fish

      1st. its delayed blow back, so not so much junk comes back.
      2nd. just because it is blowback, doesn’t mean it suppresses well. Just shoot a scorpion evo next to an MPX suppressed. tell me which one is more quiet. Id bet money on the EVO, even though its just blowback, it is finely tuned blowback. Also, with the MPX, you have a hole in the barrel for noise and junk to escape from rather than go through the suppressor or into the receiver.

      • Holdfast_II

        Dude, I wasn’t crying out of sadness or joy – it was from a face full of gas and soot. Granted the gun had already been shot a lot, but it really sucked.

      • Nicholas C

        Odd. I experienced the exact opposite with my Scorpion vs MPX suppressed. Scorpion was much louder even with sub sonic loads. Both using the Osprey45 and Tirant 9M

        • BravoSeven

          My MPX doesn’t really sound all that loud unsuppressed. Maybe it’s just me.

    • SP mclaughlin

      MP5SD

  • USMC03Vet

    And the CZ Scorpion EVO beats both!

    • Nicholas C

      Debatable. I have all three. I like them all for their own strengths.

      • PK

        Bingo! Why choose favorites when they’re all good and have different appeal?

      • Ben Pottinger

        If you were buying one specifically for running suppressed which would you buy? (Btw, I already own a MP5PDW and with the suppressor specific locking lugs, yet for some reason I still desire a fullsize mp5.. and mpx, and evo.. and the B&T uzi wannabe, and and and…)

        • Nicholas C

          The MPX sounds better suppressed. But it matters what can you use. Some cans cause gas blowback worse than other guns.

          I’m running my Osprey45 and it is awesome on the MPX.

          • Ben Pottinger

            Trident9 πŸ™‚

    • Wow!

      If you are going to go with an EVO, for the same price you can get a 9mm AR running cheaper glock magazines. Or heck, even lower price you can get a MAC fully outfitted which in my opinion is a fantastic subcaliber platform.

  • st381183

    The saying is, “Imitation is the sincerest form of flattery.”

    • Seriously, how hard is that to look up real quick

    • Nicholas C

      Or perhaps I intentionally did not use the whole saying.

      • st381183

        Perhaps….Still makes the title silly sounding.

        • Hyok Kim

          …and does that make you look like a genius?

      • undeRGRound

        That’s what you say now… πŸ˜‰
        LOL, great article!

    • Amplified Heat

      Not sure I’d call it imitation. Yeah, it’s a 9mm, yeah, it’s as small as they could make it, yeah, it suppresses, yeah it’s modular, and yeah, it’s got a pistol grip…but that’s about as far as it goes, and most of those features are part of every modern design of every gun. The MP5 is only one of a rather large and diverse set of SMGs that are all more similar than different, but was so much more successful that it came to define the genre (like “bandaid” for adhesive bandage). The MPX is much closer to a scaled down AR18 than an MP5 (just as the MP5 is much closer to a scaled down G3 than a Swedish K)

    • undeRGRound

      I’m with st381183ts

      Unless maybe the whole phrase was too wide for a presentable title on the webpage or something. Either way, TFB ROCKS and it’s a great article!
      I still prefer a CZ Scorpion, hopefully buying one this year πŸ˜‰
      Here’s my [b]GAR-9[/b] https://uploads.disquscdn.com/images/72513038397aced8168e93a3931bbdf0c36bed65dc9334ac95ba06e2968f587d.png

  • PK

    “Forward charging handles are easier and faster to manipulate than the AR style charging handle.”

    I love the MP5, but go play with an HK91/G3 and try to say that again with a straight face.

    • Nicholas C

      Ok yes those do suck. But my Scorpion, SCAR17S, and MP5 charging handles are much faster to use than the AR charging handle.

      • PK

        No argument there, as far as those comparisons go. Any other roller delayed HK or clone, anything longer than the MP5, and basically everyone runs into reach/leverage issues. The MP5 is so short it may as well be a side-charger.

        • Alexandru Ianu

          Interestingly enough that’s the reason for a design change in the new (not yet civilian) 5.56 AK from Cugir. They originally put the (non-reciprocating) charging handle out the side by the handguards, and it could be switched left/right (shown in 2012 prototypes). This was positioned like on an HK33. After testing in the sandbox, they showed the revised (and final) prototype in 2013 with a handle that sticks out almost vertically (60-70 deg) from the gas tube, as it was probably difficult to charge after switching shoulders (no LRBHO, only rock-in Wieger pattern mags).

          • PK

            It’s a common complaint of the HK style long guns that the charging handle is so far forward. While it’s always good to try different ideas like adapting the same sort of placement to other platforms, I can entirely understand why they changed the handle placement to be more accessible!

          • Hyok Kim

            Not only that the forward placement puts cg forward, making handling clumsier especially in tight quarters. I prefer regular side charging.

          • Hyok Kim

            I think the sandbox testing was not in perspective with long term reliability. Near vertical charging handle is more likely to let crap into the system due to gravity.

          • Alexandru Ianu

            Debris ingress isn’t really relevant to the front end of the piston on an AK

          • Hyok Kim

            I agree relatively speaking. So charging handle is not likely to get stuck when things pile up?

      • CommonSense23

        Why are you using the charging handle to do anything other put the gun in condition one well before you need it. Or to fix a malfunction?

        • Nicholas C

          Different reasons. In USPSA or 3Gun, sometimes a stage requires you to run chamber empty and closed at the start of a stage. But you start with rifle in hand at low ready.

          • CommonSense23

            So gaming and range purposes.

        • some other joe

          So, clearing a malfunction without coming off target is a bad thing now?

          • CommonSense23

            Yeah it is. Cause why are you still presenting a target to your target.

          • Squirreltakular

            Common sense is not a common virtue.

          • wclardy

            Bad ergonomics are bad ergonomics, regardless of tactics or technique. Whether you’re standing out like a fool or behind cover, you still have to clear the malfunction quickly.

          • CommonSense23

            And the AR changing handle does that with ease. The AR is also great for rarely having them,

          • wclardy

            Actually, the AR-15 charging handle is very difficult to operate while keeping the weapon shouldered, unlike the AR-18 and AK cocking handles, or the original AR-10 charging handle (which unfortunately had a tendency to get a little toasty from the DI gas system)

          • CommonSense23

            Again, why are you trying to charge the weapon when its at your shoulder.

          • wclardy

            Why should I have to take the weapon from my shoulder to clear a stovepipe or other FTE?
            But to be more on point ergonomically, why put important controls outside the most-easily manipulated zone on the weapon (generally, where operating the control does not take your hands more than an inch away from the receiver)?

          • CommonSense23

            Cause they don’t interfere with firing the weapon. The only reason you should be using the charging handle on the AR is loading the gun with a closed bolt or unloading the gun. And if a malfunction. If you got a malfunction, its best to either get out of the line of fire or transition.

    • Is it me, or are the MP5 series’ recoil springs are a whole lot stiffer than ARs?
      Or is it a matter of ergonomics and leverage? Because I swear charging the MP5K seems to be a Herculean effort compared to charging AR-style handles

      • ostiariusalpha

        No, they’re pretty similar to an AR-15. Sound like either an ejector rod that isn’t seating properly, or the ejector is rubbing and binding it up. At any rate, it requires some investigative maintenance.

        • PK

          O, just being unfamiliar with roller delayed guns and how they all work that way. The first small bit of opening certainly takes some work, that’s just part of the design.

        • because my experience with one was at a police exhibition, where they had an MP5K in a briefcase with external trigger mechanism. probably not as well maintained or lubricated as an exhibition piece.

          • ostiariusalpha

            The MP5K has a slightly stiffer spring, but it’s hardly Herculean to pull back. Lubrication shouldn’t make a difference for just pulling the charging handle. This really does sound like they need to get their gun maintenanced.

      • PK

        It has to do with the way a roller delayed blowback functions, and the initial force needed to open the bolt. That’s extremely normal, you’re fighting uphill with how the rollers and locking piece function!

        • Cool, like that initial kick required to unlock the lugs on a large-caliber bolt-action rifles

        • wclardy

          Actually, it doesn’t. The charging handle connects to the main part of the bolt assembly, not the bolt face, so the locking mechanism has no impact on charging.

          • PK

            It’s called a carrier, and yes, locking systems have quite a bit to do with how easy or difficult it is to manually move the carrier.

            The reason roller delay blowbacks such as the HKs have a cammed surface for the charging handle is exactly because the initial unlocking of the bolt takes quite a bit of effort. That’s how the entire delay mechanism functions.

          • wclardy

            No, the bolt carrier is designed so that retracting it allows the rollers to retract without resistance. The charging handle pulls the bolt carrier to the rear, which in turn retracts the locking piece so that it is no longer keeping the rollers pressed outward.
            https://uploads.disquscdn.com/images/eeec33f04b67015271c4c627591ee596386d5184e6d0ef8818d67d72da817b87.jpg

          • PK

            Go take the recoil spring/stock off an HK and run the CH. It still takes quite the effort to unlock.

      • Amplified Heat

        LOL, wut? Herculean? The MP5 has practically no roller delay going on at all, and the bolt can even be pushed open by hand. You sure you aren’t thinking of an improperly assembled CETME clone by Century?

        • No idea of its exact make, I had the opportunity to get my hands on one at a police force exhibition, where they had one of those briefcase-carrying MP5Ks you can shoot with an external carrying handle.

          • Hyok Kim

            I had HK P9S, roller delayed blow back, smoothest charging for pistol, ever. No initial hard push necessary.

    • Jonathan Thomas

      I use my ARr’s Charging handle once per range session. The initial charge. After that I just use the ping-pong paddle to drop the bolt mag to mag. Not so with the HK, you are on that handle constantly. This why I am not interested the slightest in PCC’s, in most cases I can build a 300 Blackout in similar length to most PCC, and the 300 BO will have triple the Muzzle Energy. Dont get me wrong I would love to add the Mp5 to my collection as most would, but it would be a BBQ SBR if that makes sense.

      • PK

        It makes perfect sense to me! I love the MP5, I love my HKs in general, but they’re nowhere near as user-friendly as the AR. They’re still fun, but as you point out you have to use the CH at least once per mag.

  • Malthrak

    While both are nice guns, given that the CZ Scorpion works just as well, is as light or lighter than either, has dramatically cheaper mags, and can in some cases be had for less than half the price of either of these guys, it’s hard to see one one wouldnt go for it over either of these, aside from just cool factor.

    • Nicholas C

      Test drive them. My MP5 is leagues more accurate than my Scorpion. MPX is fun to shoot suppressed. Just get them all. Problem solved.

      • nova3930

        I’d love an MPX but ugh…that price. Would cut into my milsurp collecting too much….

        • BravoSeven

          I purchased a MPX recently. Complete impulse buy. Walked in to the store with no intentions of buying a new gun and left with a MPX. No disappointment at all. If you can, get one. The MPX is now my favorite firearm to shoot. It’s just so much fun.

          • nova3930

            I’ll get one eventually. I just figure they’ll be more available than some of the vintage stuff I’m accumulating.

          • BravoSeven

            If you do, dig around on the Internet for good prices on magazines. You can find them a lot cheaper than what Sig sells them for.

          • Nicholas C

            Gen1 mags go for like $20-25

          • BravoSeven

            Nicholas, what do you know about the Lancer hand guard for the MPX? Good buy or waste of money?

          • Nicholas C

            It’s cool if you want Carbon Fiber. A bit pricey. But they are MLOK.

        • Nicholas C

          It’s actually cheaper than the MP5. I got my MPX second hand from my friend. Paid $1k flat.

          • nova3930

            Yah. I’m probably gonna snag a used one when I get one. Still $1k is like 3-5 of the milsurps I’ve been snagging :p

      • Richie

        If your scorpion is not accurate, there is something wrong with it, I get 10 round groups in under a 1″ spread at 25 feet

      • Malthrak

        I’ve shot them all, they’re all lots of fun, though accuracy differences that i’ve found have largely all just been ammo choice

    • Grant

      Robert RTG has 30 round POF mags for the MP5 for $30. But you are right, there is no reason to charge $90 for magazines like HK does. I keep looking for 15 rounders and right now the cheapest I can find them is 2 for $89 for POF made ones.

      I keep hoping Zenith will bring in some MKE made mags at a reasonable price.

  • JD

    While I respect Nathan F and his educated opinions, you also don’t let one mans opinion influence your buying habits. If you love pistol caliber carbines, buy one. If you think 6.8SPC II is the bees knees, then adopt it.

  • Basil Sever Moulds

    but the real question, what optic is on that mpx

  • Wow, never noticed how similar they looked until put together in a photo like this

    • Amplified Heat

      Well, when both are 9mm, both have collapsing stocks, both use curved mags, and both aren’t wasteful of space…it’s kind of like how every bolt deer rifle looks the same as every other bolt deer rifle. The operation, controls, materials, and especially weight are completely different (the MP5 is pretty damn dense for what it is, and is easily a good third of the reason for its famed controllability in full auto)

  • anonymous

    > β€œThe Sig Sauer MPX was to be an updated version of the MP5. Side by side you can see how similar they really are. They even kept the name similar to the MP5 but simply nixed the 5 for an X.”

    Or maybe form follows function?

    And “MP” stands for “Maschinenpistol” which is German for “submachinegun”. What designation other than “MP” should SIG have used?

    • Amplified Heat

      It stands for “MP5,” obviously πŸ˜‰

      I also thought that bit was funny; could have just as easily said SIG was copying Bergmann’s MP18

  • Joshua

    To each his own, but if you’re going to post multiple time on instagram pictures of your MP5 with a pistol brace, then stock, then pistol brace again when the atf decision was reversed you might wanna declare that it’s a legal SBR at some point. Otherwise, people would think it’s a illegal SBR. Like I said, to each his own but I would hate to see a member of the press loose credibility.

  • DanGoodShot

    So an AR-15 stuck its muzzle up an MP5s butt-plate and 9 months later the Sig MPX was born.

    • Amplified Heat

      More like an AR18 with dwarfism

  • JumpIf NotZero

    What mag is that on the MP5?

  • Jeff S

    I’ll take the HK, HK clone or EVO any day over the SIG. You won’t see me buying into another SIG USA proprietary firearm. No thanks.,
    Signed,
    The guy that can’t even get a parts kit for the SIG556

    • burningwar

      And now the 556 is completely gone from SIG’s website. All hail the MCX, I guess. If the MCX came with a better looking stock, I might have been interested in what is ultimately a proprietary AR with expensive parts. The 556 could always at least claim the Swiss-style folding stock.

  • Docduracoat

    The coolest thing about the H K charging handle (and also found on the Steyr Aug) is the H K slap
    When the CHARGING handle is held back in the cut out, you just slap it and the bolt runs forward
    It gives a very satisfying “thunk” and you are now ready to blast away!

  • Similar in that they both fire 9mm?

  • Hyok Kim

    I second Nicholas F on this one.

  • Tom

    Except the MPX has been plagued by problems and poor QC, gassing issues, and lack of accessories SIG promised but has not delivered.

  • Joshua

    roller delayed block back operation of the MP5.

    umm, read that one again boys

  • DirtyDave

    What kind of magazin is that with the MP5?

  • Joshua

    According to his instagram it’s not. It’s one of the shells that he dropped his semi auto trigger pack into.

  • Jacen

    That’s
    like saying that the AK was copied from the stg 44 because they share
    the same general shape. Other than passing resemblance, they don’t have
    the same operating system, charging handle, mag release, etc. The MPX is
    basically a refined piston AR15 in 9mm.

    The
    only thing similar are the curved mags but that’s because 9mm is proven
    to feed more reliable from a curved mag over a straight one according
    to H&K, which is why MP5 mags used to be straight in the early
    generations.

  • Brian Peterson

    I wish HK would just make us a legit SBR or Brace ready MP5 pistol…. I would give all my gun money for a genuine rollerdelayed HK built semi-auto MP5 pistol :-(.

  • Bloody Bucket

    MP= Machine pistol. Germany. It’s what we in the U.S. call a submachine gun. The British used the term machine carbine. And yes, I love both my transferable Machine Pistol 5 and my Thompson Submachinegun (1943 Auto-Ord Bridgeport M1, later upgraded to M1-A1). I do need one of those STEn machine carbines!

  • RickOAA .

    The MPX is far chunkier than the MP5, though they look similar on paper and in pictures.

  • Richard Lutz

    Sorry, but the MPX looks a little gay. The MP5 not only looks a lot better, it is a proven platform that is widely used by the law-enforcement and military units, and has huge aftermarket support, so I don’t see a good reason to use the MPX. The MP5 can be readily fitted with rails for optics, lasers and tactical lights. Most people are better off with one tactical long gun, namely the M4, with the FN 15 Military Collector M4 being the closest you can get the M4 used by the US Army.