The Masterkey Is Back! Tyr 1 KTMS 12-gauge

Daniel Y
by Daniel Y

The Masterkey under-barrel shotgun is famous from video games and films alike. Unfortunately, it's a difficult gun to obtain for anyone wanting their own example. The new KTMS 12-gauge from Tyr1 Outfitters is changing that, a turn-key Masterkey (pun intended) for the public.


Shotguns @ TFB:


The KTMS 12 is a collaboration between Tyr1 Outfitters, Allegheny Gun Works, and Foxhound Firearms. It uses a Remington 870 and a special bracket that attaches to a railed handguard and the M203 barrel cut out on an M4 barrel. The KTMS 12 is an NFA item, and the first batch is registered as short-barrel shotguns. While the KTMS 12 is unique, it is not inexpensive, with a retail price of $1,850. But if you want an AR attachment that is sure to be a talking point at your next range day, head over to Tyr1 Outfitters and get an order in for yours.


All images from Tyr1 Outfitters

From the manufacturer:


“There are 4 things that open doors. Introducing the K.T.M.S. 12. A barrel mounted Remington 870 AR15 attachment. Originally made famous as the Masterkey, this clone is constructed using modern guns and manufacturing processes. This was a collaboration between Tyr 1 Outfitters, Foxhound Firearms, and Allegheny Gun Works. The K.T.M.S. 12 will attach to M4 cut barrels both government and SOCOM profile. The barrel hanger mount is of our own design and attached to the barrel via a two piece mount. The LMT QD mount is directly compatible and can attach to the unit should the end user choose to swap it out. 
Please have your FFL/SOT email their licenses to tyr1outfitters@gmail.com with your order number. 
****NOTE**** This first batch will be papered as a SBS (AOW will be an option soon for certain restricted states) so ALL NFA LAWS WILL APPLY. Do not order without knowing if you can get this transferred to you.“


Find out more at www.tyr1outfitters.net

Daniel Y
Daniel Y

AKA @fromtheguncounter on Instagram. Gun nerd, reloader, attorney, and mediocre hunter. Daniel can still be found on occasion behind the counter at a local gun store. When he is not shooting, he enjoys hiking, camping, and rappelling around Utah.

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4 of 9 comments
  • David K. David K. on Oct 11, 2024

    Can I get one housed inside of the ;heat shield assembly of a SPAS 12, rigged up to attach under the barrel of a Thompson SMG?

  • JD JD on Oct 24, 2024

    Master keys were really hard on the guns back in the day and this doesn’t seem like it’s corrected any of those issues.

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