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Matador Arms Mat-9K 5 inch 9mm Upper Reciever
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Most Helpful Positive Review Runs Great with my EPC9
Got it as a gift from a friend ran 600 rounds so far. Have it on an EPC9 lower. Fun to shoot, didn't need to modify anything.
Most Helpful Negative Review matador mat-9k
Well it a nice upper took it to the range shot 2 rounds . The “ez-take down” piece broke” matador has life time warranty so called them an sent me a new one still waiting for it to arrive . I could’ve sent it back an waited for a replacement from optics planet .. the 2 shots I did get to enjoy was n...
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Matador 9k

by Tim, Verified Owner from ME, United States Written on March 27, 2025
Awesome fit. Shot flawless. Looks awesome. Get alot of jealous shooters around you.
Would recommend: Yes
Was it helpful to you? Yes | No

There Are Limitations

by thewong1, from TX, United States Written on March 18, 2025
The buffer less system works as intended, but keep in mind the upper doesn’t have LRBHO. It must be mounted on a lowers such as the Shield Arms SA9 or a Foxtrot Mike 9, they have the LRBHO on them. There in no LRBHO on rhe Aero Precision EPC 9, you can use it but no bolt hold. I had the the same issue with the guide rod bracket breaking, but a call to Matador and a new one was sent to me. Because of this piece I wouldn’t want it to be my primary defense weapon, but with or without a folding brace it makes for a fun range toy.
Pros:
  • Compact & light
Cons:
  • Parts reliability
  • Lower must be equipped with LRBOH
Best Used for:
  • range toy
  • Pack Back Gun
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No

Love it! MP5 copy

by Chan, Verified Owner from CA, United States Written on February 12, 2025
Got this and matched with New Frontier Armory lower that take MP5 mag. I also upgraded the charging block. Works flawlessly- 200 round like nothing. Use the new frontier armory lower guys.
Pros:
  • small and compact
Cons:
  • Finding the right lower for it
Best Used for:
  • Close Range
Would recommend: Yes
Was it helpful to you? Yes | No

Good range gun

by Matador arms, Verified Owner from UT, United States Written on December 13, 2024
As new as they are and the problems they have with what are considered consumable items, they're a fair range gun. I wouldn't trust the internal plastic printed components for anything other than target shooting.
Pros:
  • Sleek design and compact size
Cons:
  • Plastic recoil management and guide rod. Might last 1 shot, might last 500
  • Plastic recoil management
Best Used for:
  • Sporting
Would recommend: Yes
Was it helpful to you? Yes | No

Love to Shoot This

by Tanna, from CA, United States Written on September 30, 2024
My kids bought this for me and I have been loving taking it out to the range.
Pros:
  • Customizable
  • Fun to shoot
Cons:
  • None
Would recommend: Yes
Was it helpful to you? Yes | No

Worked out the kinks

by Steve Gillette, from IL, United States Written on July 10, 2024
This product started out needing some kinks worked out, for example initial production seemed to produce some fitment issues as well as the followers in magazines being chewed up. I have been in contact with the matador team and actually was invited to their shop where I observed the upgrades and alleviation of these issues. The stated they are also going to be including a troubleshooting card for lowers that aren't the dedicated Matador lowers. I am very happy with this product as well as the responsiveness and essentially no questions asked replacement policy. Great product and great team.
Pros:
  • reliability
  • Customer Support
  • customer input and adjustment to product
Cons:
  • initial production runs needed kinks worked out
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No

Poor fit doesn't match up with any lower

by Not impressed., Verified Owner from NY, United States Written on July 3, 2024
Tried this on a spikes 9mm lower, an anderson lower, and a joe bob outfitters 9mm lower. Rear pin won't push through. Called Matador Arms haven't heard back yet. I would not recommend this.
Pros:
  • None
Cons:
  • doesn't work
Would recommend: No
2 of 4 found the following review helpful.
Was it helpful to you? Yes | No

Mat 9K/ mp5 conversion

by Chan, Verified Owner from CA, United States Written on June 14, 2024
I finally got to match it up with a lower and I found a down fall. The MAT 9k buffer plate is sticking out and don’t allow a lower buffer tube to go in. You will need to cut part out the plate for the lower to sit in. That is why it received a 2 star from. Why didn’t they think of this.
Pros:
  • Nice quality
Cons:
  • You got to cut out the buffer plate to fit any lower
Would recommend: Yes
0 of 4 found the following review helpful.
Was it helpful to you? Yes | No
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