The Montgo-9: Matador Arms’ New 9mm Upper Receiver

| August 25, 2021
Categories: Guns

Matador Arms has announced the Montgo-9: a monolithic blowback-operated billet 9mm upper receiver that does not require a buffer (or at least not a buffer as most people think of ’em, e.b. AR15 buffer and buffer tube).

Matador Arms says, “Manufactured in the USA, the Montgo-9 is compatible with any AR-15 and/or AR-9 lower, providing shooters with endless build possibilities while compact and versatile.”


Matador Arms

The current iteration of the Montgo-9 is the K version, featuring a 5.5” barrel threaded to 1/2×28”. The back cap shows that no buffer is required, allowing for many compact options (especially if you make it a “folder” with a LAW adapter or Matador’s own Sidewinder). The Montgo-9 has a full-length integral Picatinny rail on top, a 3.5” bottom accessory rail, and a non-reciprocating charging handle.

The Montgo-9 upper receiver is made of aluminum, and the bolt and trunnion are 4140 steel for durability. Weight is 3.5lbs with an OAL of 12.125” and a 1.47” width.

This is only one of several products announced by Matador Arms of late. For instance, they recently announced their AR-9 80% billet lower receivers, the first run of which is shipping mid-September. Matador already manufactures the Mag-X, a mag block adapter enabling the use of P320, Glock, M&P, and CZ-75 pistol mags in their AR-15 lowers.

Matador’s Sidewinder is a folding buffer tube adapter that will fold up anything with AR buffer tubes threads WITHOUT a moving buffer inside.

The MSRP of the Montgo-9 as of this writing is $549.99. Shipping of the Montgo-9 is projected for Q4 of this year.

For more information on the Montgo-9, the Sidewinder, or any of their other products, visit



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