Windsor Arms Co's rare suppressed FMK-3 submachine gun (VIDEO)

Gun maker Windsor Arms Co. of Windsor, Vermont, brought their suppressed Argentinian FMK-3 submachine gun to the Green Mountain Boys machine gun shoot in Eden, Vermont in July 2018.

According to Jared LaMarche, a gunsmith at Windsor Arms Co., they’re always interested in building unique and rare guns. When they caught wind of Argentinian FMK-3 build kits being available in the US, they got their hands on one.

The FMK-3 is a select fire, blowback operated submachine gun of Argentine origin. It was designed by Fabricaciones Militares in 1974. Approximately 30,000 were produced for the Argentine military, and is still currently in use.

It was based on the U.S. M3 A1 submachine gun, more commonly referred to as the ‘Grease Gun’. But instead of the firing the .45 ACP round like the M3A1, the FMK-3 fires the 9×19mm cartridge at a rate of 650 rounds per minute.

Despite having a good design, Windsor Arms made a few improvements when they built their kit. They added a 3-lug adaptor  to the barrel to facilitate quick adding and removing of a suppressor. They also swapped out the factory sights, which they thought were cheap, and added HK-style adjustable sights, such as those found on HK MP5s. Other than that, the gun is stock.

It’s an incredibly smooth shooting and reliable submachine gun. It’s very easy to control, and according to LaMarche, if you were to hold a tin can beside the gun as it fired, you could easily catch all of the ejected brass. It’s got a very consistent ejection pattern of spent shells.

Windsor Arms Co’s suppressed FMK-3 submachine gun. (Photo: Ben Philippi / Guns.com)

Windsor Arms Co’s suppressed FMK-3 submachine gun. (Photo: Ben Philippi / Guns.com)

Windsor Arms Co’s suppressed FMK-3 submachine gun. (Photo: Ben Philippi / Guns.com)

Windsor Arms Co’s suppressed FMK-3 submachine gun. (Photo: Ben Philippi / Guns.com)

Latest Reviews

  • Four Years Later: IWI Tavor SAR Revisited

    Though IWI's X95, released in 2016, usurps the SAR, my Tavor SAR is still part of the family. For those just now coming across this model, how has it stood up over the years? Let's find out.

    Read More
  • Scope Review: Leupold VX-Freedom FireDot Twilight Hunter

    The budget-friendly line of American-made Leupold VX-Freedom riflescopes found a welcome audience last year, but 2020 sees even more interesting additions to the family, with our hands-down favorite being the illuminated-reticle FireDot line.

    Read More
  • Ruger AR-556: An Outstanding Gateway AR

    It should come as no surprise the Ruger name is synonymous with value, and its’ AR-556 looks to fit this mold as an entry-level AR-15 with a reasonable MSRP. So how does the no-frills Ruger AR-556 perform when put to the test? Read on to find out.

    Read More
  • A Look at the Sig P238, A Year Later

    The Sig Sauer P238 was the first .380 ACP BUG to grace my gun safe, a welcomed addition to the 9mm polymers, .38 SPL revolvers, and .45 ACP 1911s. After more than a year's worth of use, where do I stand on the P238? Let's find out.

    Read More

Loading