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Matador Arms Mat-9K 5 inch 9mm Upper Reciever

00:59
USED Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO2, Condition Fair, Installed/Mounted
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159, EDEMO1
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO1
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159, EDEMO1
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO1
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
1 of 1 videos
Matador Arms MAT9 Features
USED Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO2, Condition Fair, Installed/Mounted
1 of 14 images
USED Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO2, Condition Fair, Installed/Mounted
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159, EDEMO1
2 of 14 images
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159, EDEMO1
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
3 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
4 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
5 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
6 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO1
7 of 14 images
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO1
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159, EDEMO1
8 of 14 images
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159, EDEMO1
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO1
9 of 14 images
EDEMO Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO1
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
10 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
11 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
12 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
13 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135
14 of 14 images
Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135

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Questions & Answers
Is this the roller delayed version?

No it is the blow back. You can tell by the charging handle slide.

by Atxblackbelt, Verified Owner, August 26, 2025
Will this work with a binary trigger? Manufacturer Answer

Yes with Franklin Armory no with fostech.

by Matador Arms, Manufacturer, January 29, 2025
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
There Are Limitations by thewong1, 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 c...
Read More...
1/1 found this helpful
Helpful Positive Review
Worked out the kinks by Steve Gillette, 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 ...
Read More...
1/1 found this helpful
Helpful Positive Review
Runs Great with my EPC9 by Whiskey, June 20, 2024
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.
1/1 found this helpful
Helpful Negative Review
Poor fit doesn't match up with any lower by Not impressed., Verified Owner, 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.
2/4 found this helpful
Most Recent Reviews
Matador 9k by Tim, Verified Owner, March 27, 2025
Awesome fit. Shot flawless. Looks awesome. Get alot of jealous shooters around you.
Most Recent Reviews
Love it! MP5 copy by Chan, Verified Owner, 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.
Read All 10 Reviews

Product Discontinued by Manufacturer

Matador Arms Mat-9K 5 inch 9mm Upper Reciever has been discontinued by Matador Arms and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

Product Info for Matador Arms Mat-9K 5 inch 9mm Upper Reciever

This upper receiver is side-folding compatible and features Matador Arms patent-pending EZTS Easy Take-down System with no tools required to break down the upper for maintenance and cleaning. The 9mm upper is machined for maximum weight reduction, slim profile, and compatibility with bolt catches and lower receivers. The upper is also built with a tapered multi-material 4-piece trunnion system to maintain mechanical accuracy and durability. This is the shorter version with a five inch barrel.image

Features of Matador Arms Mat-9K 5 inch 9mm Upper Reciever

  • Non-reciprocating steel charging handle (ambidexterous)
  • 4140 Nitrided steel bolt and action parts
  • 6061-T6 anodized upper receiver
  • 4150 Lightweight Nitrided Barrel, 5in long, 1:10 twist, 1/228 threads
  • NATO 1913 Spec top rail
  • 1 Mlok slot (both sides, bottom)
  • Compatible with LRBHO (Last Round Bolt Hold Open) lower receiver
  • Ready to run with a Suppressor right out of the box!

Package Contents:

  • Matador Arms Mat-9K 5 inch 9mm Upper Reciever

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Matador Arms Mat-9K 5 inch 9mm Upper Reciever Unavailable & Discontinued Models

List of Unorderable Models

  • USED Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO2, Condition Fair, Installed/Mounted , MPN: 850045441142-EDEMO2 , Code: MDA-URC-MAUR1-850045441142-EDEMO-IN-D
  • USED Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142, EDEMO1, Used, Condition Fair , MPN: 850045441142-EDEMO1 , Code: MDA-URC-MAUR1-850045441142-EDEMO1
  • USED Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159, EDEMO1, Used, Condition Like New , MPN: 850045441159-EDEMO1 , Code: MDA-URC-MAUR1-850045441159-EDEMO1
  • Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, FDE, 850045441142 , MPN: 850045441142 , UPC: 850045441142 , Code: MDA-URC-MAUR1-850045441142
  • Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Gray, 850045441159 , MPN: 850045441159 , UPC: 850045441159 , Code: MDA-URC-MAUR1-850045441159
  • Matador Arms Upper Reciever, Mat-9K, 9mm, 5 inch Barrel, 1-10 Twist, 1/2x28 Threads, Black, 850045441135 , MPN: 850045441135 , UPC: 850045441135 , Code: MDA-URC-MAUR1-850045441135
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