CMMG’s New Mk57 Pistols and SBRs in FN 5.7x28mm

1. Magazine – 20 Round promag – ewwwww gross

   • Can be used with FN FiveSeven 30-round Pistol Magazines! And CMMG also has a 10-round extension to FiveSeven 30’s “Old Style” Magazines to 40-round magazines…

2. Imagine thinking 5.7×28 is an effective round for self defense.

   • Hey, worked fine for SG1

     • Worked for LLENN too.

       • LLENN?

   • Defeats most body armor…unless it has plates.
     Lots of rounds.Easy to control.
     Pretty expensive ammo, though.
     And the weapons are not cheap, either.

     • I saw a video on that some time ago on youtube. Shot from a pistol, the 5.7 could not penetrate body armor. But shot from the longer barrel of the P-90? carbine it could. (The weapon used on the Stargate series) So how long is that barrel and is it long enough to give it enough FPS to go through body armor?

       • 5.7 depending on ammo type will most certainly destroy most level IIIA panels from the Pistol..

   • I can tell you first hand that the SS197SR round does a number on pigs under 50 yards. I imagine it would be equally effective on humans.

     • I never saw a pig 50 yards, that would be a monster pig the size of a dinosaur.

   • Here is a playlist of 3rd party testing of Elite Ammunition’s 5.7.
     https://youtu.be/ocmwzC9o728

   • Uhh… it’s not a bad option, actually. With proper shot placement and follow up shots, it can be effective. Ballistically similar to a .22 mag, which while not massively powerful can certainly do some damage. Biggest advantage I could see with this rifle is that the 5.7 has similar characteristics with regard to overpenetration as the 5.56, but you can get that out of a much shorter barrel. In other words, if you live in a condo or an apartment building with neighbors on both sides, above, and below you, this could make for a phenomenal choice

3. I can see this as an interesting choice for people looking for a barrier sensitive Home Defense platform. While most of the firearm community interest is in barrier blind loading, for people in urban environments, barrier sensitive loading’s make more sense.

   • I’m sorry but chambering anything in something else besides 6.5 Creedmoor is so not hot right now.

4. I’ve always enjoyed my FiveseveN. May need to grab one of these carbine SBRs. For the price though, may as well get a PS90 and get it converted to SBR.

   • This was exactly my thought. I got the MIL/LE deal on my PS90 and paid $950 for mine. I’ve seen them around $1000-1300 regular price. 50 round mags are usually under $20 for FN when I bought mine and if you want to chance it, grab some Korean mags for less than that and hope they work right. I plan to SBR mine and slap a can on it. It’s a fun little rifle.

5. I’ve got a short barrel 5.7 upper on an AR pistol, makes for a great HD gun and it does have a 50 round mag so load on Sunday shoot all week :)… seems they aren’t making that upper any more though, wonder why?

   For those who poo poo this round, it’s what that terrorist used in Texas during his “workplace violence” moment. I think it will work fine for home defense.

   • I think YOUR wrong. If my memory serves me correctly. There was an interview with surviving US soldiers of THAT terrorist tragedy. That some of our guys were shot with the FN Five7 and it fortunately failed to stop them…But of course, as anyone would know…The .357 magnum the terrorist was using turned out to be the most effective as I understand this incident…

     • https://en.m.wikipedia.org/wiki/2009_Fort_Hood_shooting

       I know Wikipedia is a horrible source, but they say he never used the 357 magnum. I remember the reports at the time saying he used the 5.7 as well… what’s your source?

   • Dude, it doesn’t matter what gun or caliber the Texas military terrorist would have had. He was straight executing unarmed dudes in the dome at point blank range at sick call. Then when he went into the actual gun fight with the MP chick, both fully expended rounds until slide-lock with neither party dead. Yeah, the real hero of the day was the FiveseveN. Suuuureee.

     • Shifting goalposts… my post was responding to those saying it’s a crap round. Whether you shoot at an unarmed assailant or an armed one (does that automatically give him 5+ armor and 5+ health when he is armed?), my point was that it has been used in recent history with terminal results.

       The response was that he didn’t use that round to kill anyone, to which I responded.

       You then shifted the point of the discussion to suit your needs, maturely too! Congratulations, you win the internet for today!

6. Hmmm… $1400 for a 5 pound pistol that shoots a round almost as powerful as 9 mm. Let’s go with ‘pass’ on this one.

   • Maximum Range of 9×19 Pistol ~250-meters vs. Maximum Range of 5.7×28 Pistol ~1,510-meters. Hummm, ~6.04 times it range! No Brainer…

     • 1500 meters? according to this ballistics chart, a 30gr bullet goes 250m from a 16″ barrel, then tumbles into the dirt.

       http://www.57center.com/21.html

       • @ million

         https://www.pewpewtactical.com/fn-five-seven-review/

         …

       • Sich But honestly you know NOTHING about firearms nor ballistics. Lighter than .223 and slower, but twice the range? Read your own link, EFFECTIVE range 55 yards!!!

         Go out a shoot once in a while, you may get a better idea when something is BS

         • @ Binder

           Read my comment from above! I never mentioned “Effective Range”, but “Maximum Range” instead…

       • Maximum effective range is 55 yards… out of a Five-seveN, which only has a 4.8″ barrel. Out of an 8″+ barrel, I’m betting the ballistics might improve a little bit (just like a 5.56mm/.223)

     • Still that pales in comparison to the Creedmoor’s maximum range of 1500 miles.

       • I was wonder when you were going to Redirect the Subject to the 6.5 Creedmoor. Which has absolutely nothing to do with the Article! Not long at all…

       • I almost said .308 instead, but we all know that the Creedmoor is the most deserving round for ridiculously over the top accolades. Like saying the 5.7’s maximum range is over 1500 yards.

         • @ Gov. Willian J LePetomane.

           Maybe you should Check Out the .17 “Incinerator” in .50BMG instead.

           ( http://bullentin.accurateshooter.com/2017/04/17-incinerator-ultimate-varmint-cartridge-with-mach-5-speed/ ) …

7. Pretty cool.

   The AR continues to be a “Wundergonne”

   Looking forward to the review.

   • Yup, the wonder is gone…

8. Can’t help but notice the price is roughly the same as a PS90 so that seems like the fair comparison. I recently got a chance to shoot a P90 and I LOVED it, but there is something to be said for normal magazines and AR-15 manual of arms.

   • And there is something to be said for 5.56.

     • That it’s stupidly loud from a short barrel, have greater recoil, no better suppressed, huge powder flash that probably even makes it out of the can on a barrel this short, has a larger magazine…

       But point taken, if you’re gonna bother with a platform as large as the AR15, you might as well go with 5.56 (or at the very least nearly double your ammo capacity using an AR57 upper w/ 50 rnd P90 mag)

       • And also that 5.56 is a joke out of a really short barrel

9. The real magic here is the radial-delayed blowback system.

   One of the issues that plagues the P90/5.7×28 platform is the host guns are direct blowback. Because of that, and the tendency for dirty direct-blowback guns to blow up when using bottle-necked cartridges, the ammo can’t really be reloaded as it has a proprietary dry-lube finish applied to the cartridge case.

   However, if you have a host platform with a locked-breech delayed system, then you should be able to reload 5.7 and even hot-rod it a bit without worrying about blowing up your guns.

   This is actually pretty exciting to me.

   • Less exciting than you’d think, sadly;
     1) The round uses so little, of such a fast burning powder, there is very little fouling blowback or otherwise
     2) The lube/film stuff lasts a few sizings, at least longer than the real limiting factor for reloading which is…
     3) The primer pockets, which even at normal 50,000psi levels, loosen up after as few as two firings

     Guys have done DI ar15 and even single shot bolt/break action builds, and the case head itself simply isn’t strong enough to go much hotter. Especially not if you have any dreams of reloading. That skinny case head simply doesn’t reinforce the (relatively) giant primer pocket well enough to reach up into magnum-rifle 60,000psi territory.

     22 Spitfire was a great alternative that probably could stand some hot-rodding without falling apart, and without giving up terribly much on the capacity (like 10% or so). But 5.7 is here to stay and is good enough at its job of approximating close-range 9mm effect but using far less to achieve that.

10. Shouldering the brace! What’s the new new new current ATF ruling on that? I’ve lost track.

    • It is kosher again. for the moment anyway.

11. that is a hot round. i would prefer 10mm especially in cm.
    delayed roller is just way too cool. can i mention certain circa ’52 pistols yet? i don’t want to queer anyone’s deal, but pull the trigger already. if you don’t get the armorers kit there is still a healthy aftermarket for springs, firing pins and rollers. not to mention a slide release.
    sidestepping that, but still referencing 7.62×25 i gotta say: ppsh41 quest continues.

    • Anything in 7.62×25 gets me all tingly.

      • Me too, How about an AR pistol in 7.62×25

12. Yawn.

    Keltec already has the market cornered with their .22 magnum pistol and carbine.

    • If any of their stuff actually worked, wasn’t totally put together with shit, and glued in barrels, maybe they could.

13. I always thought one of the things that hurt the 5.7mm round was the lack of carbine/rifle options that took the pistol mags. What few options I saw were always the PS-90 mags. Being able to use the same mags for both your rifle and pistol always seemed like a no brainer to me. Not as powerful as 5.56mm, sure… but for a lot of applications, it’s powerful enough out of a 10″ or 16″ barrel, and without the muzzle flash/noise you’d get from an unsuppressed 5.56mm carbine or SBR.

14. The price on 5.7 ammo would be better if more people would buy the guns and demand more ammo. Essentially, there are the two FN guns, a couple AR57’s, and now these. There’s not a huge market for the ammo, so it’s costs a bit more.

    • More ammo would be nice, Sellier & Bellot/ Magtech have been talking about making some for the last two years

15. One word: LOUD

    I’ve been near a 5.7 at an indoor range. I would not want to fire one indoors. You or you loved one could loose hearing. Of course always keep ear pro by your home defense weapon.

    • Buy a can, if you can!

16. Everyone keeps talking a price and availability, but my primary carbine has been a PS90 for almost three years. It’s been a trunk gun, a bed side gun, and my get home gun, and I’ve never had an issue getting ammo.

    Few cents more than 5.56, but overall pretty comparable, especially online. Even for Green Tip SS198.

17. The 5.7 cartridge gets its performance from its velocity.
    The fn rounds sold to the public do not perform to the rounds potential. Try some of elite ammunitions TB6 rounds and you’ll see what the hype is about. 2400fps out of a pistol..

18. About as effective as a 9mm at three times the price per round (source: http://www.wikiarms.com).

    Where do I not sign up?

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