Uruguay SF Now Fielding Indigenous .50 BMG

Uruguay’s special forces units are now fielding a .50 BMG precision rifle named the FS50 Peregrino. The single shot bolt action rifle looks very much like a Serbu BFG 50, but was developed and built entirely in Uruguay over a period of approximately two years. Its main distinguishing feature is that with the bolt removed, the barrel can slide back to the rear of the receiver, shortening the rifle more than a foot for easier transportation. Restoring the gun to firing condition is said to take about a minute, and the rifle has been cleverly designed to retain its zero after transitioning back and forth between transport and firing mode many times.


The trick to retaining zero is that the 1913 Picatinny mount for the optic is mounted on the barrel itself, and slides rearward through a cut in the top of the receiver when the rifle is put in transport mode, thus maintaining the relationship of the optic and barrel to each other regardless of barrel position in the receiver. Comparing the photos of the gun in each mode, one can easily see the difference in position of the optic relative to the rifle’s buttstock in the two modes. The bolt is a beefy, Mauser-ish two lug design, and the Peregrino is shown with a side saddle holding four extra rounds on the right side of the receiver. The usual beefy steel bipod and giant fish-gill muzzle brake are other obvious .50BMG traits.


Barrel twist rate is 1 turn in 15 inches, and total barrel length is 30 inches. Weight is around 31 lbs with optic, which in the photos appears to be a 20 power SWFA Super Sniper mounted in four beefy Badger Ordnance style rings. The rifle is said to be sub-MOA and effective range is advertised at one thousand meters. The number of FS50 Peregrinos currently in service, and the total number to be purchased by the Uruguayan military, are unknown at this time.


  • John184

    I don’t know how accurate it could be if the barrel can slide back like that.

    • Mr Mxyzptlk

      As it says the sight rail is attached to the barrel so there is not loss of
      zero issue, and the barrel is secured in the receiver by a barrel nut,
      hence why it takes a minute or so to get it into action. Assuming the way the barrel interfaces with the receiver is well made, it shouldn’t be any less accurate than a rifle without the feature. As these things always go though it is one more thing that can go wrong, particularly if the barrel nut isn’t done up properly due to debris in the threads or just human error, but obviously they felt it is worth the compromise to make it more transportable.

    • Tom

      If it takes a minute or so to put it back into firing condition then it stands to reason its not a simple “slide forward/slide back” type operation but rather has some sort of locking mechanism in addition to the bolt.

    • Komrad

      I guess you should read the article then.

  • NotSarcasm

    Nice to see what countries around the world are fielding, but single shot .50 BMGs just don’t impress me as much as they used to. Why not not just put the resources into making a semi? I guess some countries just have different needs.

    • Mostly the retail price. Retail cost have gone just as crazy as all of the other rifle prices.

    • Esh325

      Probably would be heavier, and the compact design with the barrel wouldn’t have worked.

      • Clodboy

        Semi-autos are also generally less accurate due to the moving parts. Also, seeing as how South America countains a lot of Jungle terrain full of dense foliage, the ability to slide the barrel back for extra compactness might be a pretty important consideration.
        But yeah, in general I don’t see the point of single-shot .50cals – if you’re not going with a semi-auto you’d atleast want a magazine in order to be able to deliver a sufficiently quick follow-up shot. At extreme ranges of over a mile, even the best snipers might need that second bullet to eliminate an enemy combatant. “One shot – one kill” might be a nice catchphrase, but it’s just not possible to do it every time.

    • Manny Fal

      For a equivalent accurate rifle in semi, it would be alot more expensive to buy, maintain and train to use. Not to mention they wouldn’t be able to make it shorter for transport.

  • FourString

    When you said “beefy,” you were dead serious.

  • Giolli Joker

    Clever design…
    At first, seeing the first picture, I thought about a clone of one of the many designs of single shot .50s… it’s been a nice surprise to see that they put some real engineering behind to offer new solutions.

  • bbmg

    The muzzle brake is interesting, it looks vaguely like a suppressor baffle stack with the tube removed. Which begs the question, why not just slip a tube over it?

    A suppressor effectively dampens recoil by greatly reducing the velocity of the gasses escaping the muzzle, as well as adding some weight to the system. The 50 cal bullet screaming downrange at just under mach 3 makes its own noise but reducing muzzle blast and flash is surely beneficial to keeping the shooter concealed.

    Barrett seem to have decided they can get the best of both worlds with the QDL: http://www.barrett.net/firearms/qdlsuppressor – if a suppressor is doing its job, the muzzle brake portion should not make much of a difference, but interesting concept nonetheless.

  • zap

    Well done; way to go Uruguay!
    It shows that relatively small nations can procurr their hardware locally, if will and capabilities exist. This can be good case for larger and traditionally industrial nations.

  • cryoform

    You mean to tell me that Uruguay has created the beginnings of a Mass Effect-style collapsible firearm? Yay!

  • Lance

    Doesn’tsurprise me doesn’t take much of an industry to make single shot bolt action rifles.