Barrel Lengths: 8 inch or 5 inch. Material: 4140 Nitrided steel. Thread Pitch: 1/2X28. Coating: Black Nitride. Barrel Twist Rate: 1:10. Compatibility: Any 9mm ammo including +P. Note: These are not AR9 barrels these are specific to our platform. Note: Barrel nut socket wrench is required for disassembly. Functions great, looks great. - Matador Arms Mat9 7.825 in 9mm Upper Receiver. by Gregg Burke , Verified Owner from NV, United States Written on December 10, 2023. Review for Matador Arms Mat9 7.825 in 9mm Upper Receiver. Matador Arms Mat9 7.825 in 9mm Upper Receiver. As Low As $575.00 Save Up to $24.00. View Product.Crafted with precision, the AR9 pistol grip features an ergonomic design that promotes a natural and secure grip. Its textured surface provides a non-slip grip, ensuring stability and confidence during rapid-fire or extended shooting sessions. Aesthetically appealing to the overall appearance of the MAT-9 and any AR-9 set up.LRBHO not working on Mat9 upper paired with Mat9 lower. I just got the Mat9 upper to go with a Mat9 lower and with an empty Glock magazine inserted when I rack the bolt it doesn't stay locked back. Any ideas why? u/MatadorDave.Full disclosure, I’m Matador’s designer, but personally I have thousands upon thousands of rounds through MAT 9 uppers. We had a minor issue with one batch of BRN charging handle slides, long since solved, and since then most “issues” have been typical AR9 compatibility stuff, minor fitting required for X feed ramps in Y lower, erc. Reply.Matador customer service is how companies should all treat their customers. Had an issue with the charging handle block and sent an email. Dave the President of Sales @matadordave emailed me back and got me a new one in the mail, no questions asked.Lightweight Nitrided Barrel: The MAT9 Upper Receiver comes equipped with a 4150 Lightweight Nitrided Barrel measuring 7.825″ in length, featuring a 1:10 twist and 1/2×28 threads. This combination ensures exceptional accuracy, while the lightweight feature reduces overall weight for improved maneuverability. 8.We took the MAT-9 Universal 9mm Upper Receiver to the Gun Range in Phoenix and went to town. NO Cars or Drones were damaged during the filming.For full prod...This one's for AR-15 pistol and pistol-caliber AR fans! Caleb gives us a detailed look at the Brownells BRN-9 upper receiver. This complete upper chambered i...$575.00. Shipping: Calculated at Checkout. Current Stock: 10. Quantity: Add to Cart. Add to Wish List. Description. Introducing the MAT-9™, the NEXT Generation blowback 9mm AR upper receiver. This bufferless upper is monolithic (self-contained) and works with most AR lower receivers and a variety of the most poplar 9mm magazines. Description.Ready to upgrade your AR? Check out the Matador Arms Mat-9 Blowback Upper Receiver!We took the Matador Arms Mat-9 for a test run and were blown away by its p...This video is a product overview produced by After Action, LLC, a leading commercial photography and video production company in Mesa, AZ, specializing in Fi...MAT9-U-FDE Product Info for Matador Arms Mat9 7.825 in 9mm Upper Receiver The Mat9 Upper is a self-contained complete 9mm receiver. Bufferless, compact and reliable. The blowback system runs suppressed or unsuppressed without spring changes. The charging handle is non-reciprocating and reversable for right or left-handed shooters.Aug 26, 2021 · 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. The Montgo-9 adds to Matador’s 9mm product offering. Matador recently announced their AR-9 80% billet lower receivers, the first run of which is shipping mid-September.\. The MATADOR ARMS MONTGO-9 upper receiver stands out with its hard-anodized billet aluminum construction, which ensures durability and strength without compromising weight. Weighing just 3.5lbs and with an OAL of 12.125 inches, it is remarkably compact, making it suitable for various applications, including personal …22 Jan 2023 ... Matador Arms is excited to announce their new universal 9mm upper receiver: the MAT-9. Join Wes as he chats with Justin about the different ...AU-14369. Matador Arms MAT-9 Upper Receiver Assembly - Gen2, Black. The MAT9 Gen2 Black features a CNC-machined aluminum receiver set that is both durable and lightweight. The upper and lower receivers are designed to fit tightly together, ensuring consistent accuracy and reliability. Additionally, the full-length Picatinny rail on the top of ...9mm Luger. Attachment Type: M-LOK. Barrel Contour: Lightweight. Finish: Anodized. Show All Specifications. Restriction. Restricted Part: Yes. Description. The Mat-9 Upper is a …Jan 12, 2023 · Matador Arms would like to proudly introduce the MAT-9™ blowback bufferless and monolithic (self-contained) upper receiver for lower receivers and almost all 9mm magazines. This upper receiver is side-folding compatible and features Matador Arms® patent-pending EZTS™ “Easy Take-down System” with no tools required to …A full build Mat9 is on my list, but I've got too much other stuff ahead of it. Envious of anyone picking this up right now. Hopefully we can get another discount code in a couple months after tax time.The MAT 9 / BRN 9 Bolt has been designed to be as compatible as possible, but may interfere with some feed ramp towers (certain Colt and CZ style lowers). If you have a 9MM AR style lower with a feed tower and cannot pin your upper on, follow the steps below: Follow the ejector fit steps listed previously. Remove recoil assembly, slide bolt to ...Matador Arms MAT-9 Upper Receiver Assembly - Gen2, Black. The MAT9 Gen2 Black features a CNC-machined aluminum receiver set that is both durable and lightweight. …We took the MAT-9 Universal 9mm Upper Receiver to the Gun Range in Phoenix and went to town. NO Cars or Drones were damaged during the filming.For full prod...Matador Arms MAT9 9mm Complete Upper - BLACK. <p>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 ... EZTS (easy take-down system) parts replacement kit. $ 35.00 Add to cart. Showing 1–16 of 26 results. 1. 2. →. Products Archive - Matador Arms LLC. Thanks Man! Matador Arms Mat9 upper 575 at mmc armory Vortex strikefire 199 MKM Machining Pistol Grip 60 EPC lower set up 250 Supressor was like 999 i think. Matador Arms brought to SHOT Show 2023 their new MAT-9 blowback 9mm upper receiver assembly which is the improved version of the earlier released Montgo-9. Compared to the Montgo-9, MAT-9 has a longer barrel (7.825” vs 5.5″) and forearm yet at an overall weight of 3 lbs, it’s lighter than the Montgo-9 by about 3 oz. Matador Arms @ TFB:The MAT-9™ 9mm AR upper is compatible with AR-9 Lower receivers in any double-stack magazine configuration: Glock ®. Sig Sauer ®. Colt® Stick Magazines. HK® MP5™. CZ ® Evo Scorpion™. With an AR-15 Lower Receiver it requires our Mag-X™ magazine conversion kit or equivalent type product such as Endomags. Some Additional Key …Jan 25, 2024 · The MAT-9K features an uber-short five-inch barrel, and the standard MAT-9 uses an eight-inch barrel. These are straight blowback-operated firearms and use Glock pattern magazines. The setup uses a buffer contained in the upper receiver, and the charging handle is pushed to the front of the gun, where it rides over the top of the barrel. MAT-9 9mm AR Upper. The MAT-9™ 9mm AR upper receiver is machined for maximum weight reduction, slim profile, and compatibility with bolt catches and lower receivers. Price: $599.00. brownells.com.Jul 10, 2023 · So, here is a project gun i am putting together to do a video review on, this is the Matador arms MAT-9 upper on a dedicated PSA Colt mag lower. The cool thing about this upper is that it accepts any of the double stack 9mm magazines you can put into a AR lower, Glock, MP5, EVO, Colt SMG. The upper so far seems to be really well made, the issue ... A full build Mat9 is on my list, but I've got too much other stuff ahead of it. Envious of anyone picking this up right now. Hopefully we can get another discount code in a couple months after tax time. Reviews & Ratings for Matador Arms Mat9 7.825 in 9mm Upper Receiver. — 6 reviews. Hands down the best option if you're looking to build a PCC. Easy operations and very accurate. The monolothic upper is a huge pluse and makes building a PCC very easy and straightforward. I would highly recommend this receiver to anyone in the market to build ... 22 Jan 2023 ... Matador Arms is excited to announce their new universal 9mm upper receiver: the MAT-9. Join Wes as he chats with Justin about the different ... Matador Arms Mat 9 . What are people's thoughts on the MAT 9? I really like the bufferless design and it's price (thinking of buying their upper for black Friday at ... Jan 25, 2024 · The MAT-9K features an uber-short five-inch barrel, and the standard MAT-9 uses an eight-inch barrel. These are straight blowback-operated firearms and use Glock pattern magazines. The setup uses a buffer contained in the upper receiver, and the charging handle is pushed to the front of the gun, where it rides over the top of the barrel. 21 hours ago · Description. MAT9-UGRY. Product Info for Matador Arms Mat9 7.825 in 9mm Upper Receiver The Mat9 Upper is a self-contained complete 9mm receiver. Bufferless, compact and reliable. The blowback system runs suppressed or unsuppressed without spring changes. The charging handle is non-reciprocating and reversable for …Finally finished up my Mat-9 paired with NFA C-5 lower but I'm having huge issues with it. I constantly get failure to feed or failure to eject every one to three rounds. I've tried reaching out to Matador Arms multiple times but no reply. I ended up emailing NFA but they said to refer to Matador Arms about the issue.Matador Arms MAT-9 9MM Blowback Upper Receiver This upper receiver is side-folding compatible and features Matador Arms® patent-pending EZTS™ “Easy Take-down …Description. Available for Glock® 17/G19, Sig Sauer® P320™. The Mag-X allows you to use your pistol magazines in any AR-15 milspec lower – the ultimate PCC-pistol combination for Glock®, Sig®-P320, & CZ® 75. Fits any standard AR-15 lower receiver. No modifications required to your lower or magazine.This is the first part in a two part series that details the unboxing and review of the Matador Arms MAT-9. Part one introduces the product and tests differe...Matador Arms has recently shown off their latest in pistol caliber carbine upper receivers with the new MAT-9K currently being offering in both black and FDE.. Matador Arms states “This upper receiver is side-folding compatible and features Matador Arms® patent-pending EZTS™ “Easy Take-down System” with no tools required to …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. The MAT-9™ 9mm AR upper is compatible with AR-9 Lower receivers in any double-stack ...25 Jan 2024 ... Check out the HVCZ MAT9 build in action. Breakdown includes the Matador Arms MAT9 upper. Strike Industries folding pistol brace. The MAT 9 / BRN 9 Bolt has been designed to be as compatible as possible, but may interfere with some feed ramp towers (certain Colt and CZ style lowers). If you have a 9MM AR style lower with a feed tower and cannot pin your upper on, follow the steps below: Follow the ejector fit steps listed previously. Remove recoil assembly, slide bolt to ... 21 hours ago · Description. MAT9-UGRY. Product Info for Matador Arms Mat9 7.825 in 9mm Upper Receiver The Mat9 Upper is a self-contained complete 9mm receiver. Bufferless, compact and reliable. The blowback system runs suppressed or unsuppressed without spring changes. The charging handle is non-reciprocating and reversable for …Matador Arms, MAT9 Upper, 9mm, 7.825 Barrel, Black. UPC: 850045441005. ID: 4728116 ¤. Low quantity! $595.24. As low as $29.71/month. Learn More. The MAT-9™ 9mm AR upper can be configured to work in multiple ways: Native Mode: Works with all AR-9 Lower Receivers that use the following double-stack 9mm magazines: Glock ®. Sig Sauer ®. Colt® Stick Magazines. HK® MP5™. CZ ® Evo Scorpion™. Matador Arms would like to proudly introduce the MAT-9, the NEXT Generation blowback bufferless and monolithic (self-contained) upper receiver for lower receivers and almost all 9mm magazines. This upper receiver is side-folding compatible and features Matador Arms® patent-pending EZTS Easy Take-down System with no tools required to break …Upper Assembly Option *. Unassembled Assembled (+$19.99) Quantity. Add to Cart. Description. Matador Arms Montgo-9 Complete 9mm Upper. The Matador Arms Montgo-9 Complete 9mm Upper fits most AR-15/AR-9 Lowers. This upper features a 5.5-inch barrel crafted from 4140 steel with a black nitride finish. The billet aluminum upper receiver is …24 Mar 2024 ... Matador Arms MAT-9 Bufferless 9mm Upper Receiver Features. Matador Arms•3.8K views · 1:33. Go to channel · HVCZ MAT9 AR9 Side Folding Pistol.Our MAT-9 lower receivers feature an ambidextrous setup by battle arms development, ensuring seamless operation for both left and right-handed shooters. The Lower has a complete enhanced mil-spec trigger. It has LRBHO (Last round bolt hold open) capability and will work with seamlessly with our MAT-9 upper. They are enhanced with the Matador Arms ergonomic grip for superior handling and ...The Matador Arms 9mm PCC upper is a bufferless design that’s compatible with a wide variety of 9mm lowers, is completely made in the USA and retails for under …Turns out the BRN-9 is a Matador Arms product, with some improvements from the Montgo-9. There is now a brass deflector, and there is no screw holding the action together. ... Quite a few pictures and videos of the combo (MAT9 version) being shot on social media, I have a few thousand through the combo. . ARV lower is on the way to …Jul 9, 2023 · MAT-9 9mm AR Upper. The MAT-9™ 9mm AR upper receiver is machined for maximum weight reduction, slim profile, and compatibility with bolt catches and lower receivers. Price: $599.00. brownells.com. 7 Aug 2023 ... This is the first part in a two part series that details the unboxing and review of the Matador Arms MAT-9. Part one introduces the product ...Not in direct blowback, you can't. The law of PCCs is that anything modern is a $1500+ simple blowback design with AR ergos, even though they can make gas piston/DI/delayed blowback rifle caliber firearms for half the price.Matador Arms MAT9. New Frontier Armory C5 Lower. Strike 1913 adapter. Sig Gen1 MCX "Kate Moss" stock. KM3 Kate Moss riser. KM3 SD Style Handguard for MAT9 (now live) Atibal Optics STD sight. Matador NBT-L grip. NIghtstick WML.The Montgo-9 adds to Matador’s 9mm product offering. Matador 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.Call: 707-416-8847 Email: [email protected]. Address: 10564 Sentinel Drive San Antonio, Texas 78217. Please select your productThe Mat9 Upper is a self-contained complete 9mm receiver. Bufferless, compact and reliable. The blowback system runs suppressed or unsuppressed without spring …shop at brownells with my exclusive followers code use discount code "tc10" for 10% off orders over $150https://bit.ly/3t9xi9gshop optics planet herehttps://...Finally took out my Mat9-K ... Post your Matador Arms builds and questions! Members Online. Designed my own tail cap for the Montgo 9 upvotes r/MatadorArms. r/MatadorArms. Post your Matador Arms builds and questions! …There might be a step on the tip of the firing pin cause the issue. You can either file the step down or have matador arms send you a new one or order a pistol caliber ar firing pin. Hope this helps. 1. Reply. 29 votes, 20 comments. 18K subscribers in the AR9 community.Matador Arms Mat-9 Range Review Video. FINALLY got the Mat-9 out to the range! It was a joy to shoot. Absolutely no malfunctions with Colt or Glock mag lowers. My video machine crashed and I lost all my older stuff over the winter, plus over the last few months I forgot almost everything I knew about video editing, so it's a little rough.Colts are king and always will be. ... SD hand-guard looks and feels fantastic on our mat9. ... best etched reticle. This build bangs.Low Prices on Matador Arms Gun Parts + Free Shipping on orders over $49! Toll-Free: +1-800-504-5897 Help Center Check Order Status. About Us Policies Reviews How To. FREE SHIPPING & FREE RETURNS* ... 3 models Matador Arms Mat9 7.825 in 9mm Upper Receiver (6) As Low As ... Matador Arms – MAT-9 Monolithic Upper. 🔍. SALE! $ 699.99 $ 539.99. 9mm Straight Blowback Upper. Works with almost any 9mm PCC style magazine. Functions normally with stock folded. Works with Bolt Hold Open Latch. JSD Supply AR 15 Combo Comes in 3 lengths, 7.5 10.5 and 16." Lightweight Nitrided Barrel: The MAT9 Upper Receiver comes equipped with a 4150 Lightweight Nitrided Barrel measuring 7.825″ in length, featuring a 1:10 twist and 1/2×28 threads. This combination ensures exceptional accuracy, while the lightweight feature reduces overall weight for improved maneuverability. 8.Matador Arms is excited to announce their new universal 9mm upper receiver: the MAT-9. Join Wes as he chats with Justin about the different use cases and ben...May 1, 2023 · Just received my MAT-9 Pre-order in the mail and I take my first impressions on functionality and build quality. NON-SHOOTING. Please check out other videos ... Matador Arms Mag-X Glock. Mag-X The Ultimate adapter for people looking to convert their AR-15 to an AR9. $ 140.00. 20 in stock. Matador Arms Mag-X Glock quantity. Add to cart. Description Additional information Description. Available …Matador Arms stands proudly as a U.S. Veteran Owned firearms and accessories manufacturer rooted in the heart of Texas. Check out our products Accessories & Parts (16)Amazing upper - Matador Arms Mat9 7.825 in 9mm Upper Receiver. by Matt , Verified Owner from NC, United States Written on October 26, 2023. Review for Matador Arms Mat9 7.825 in 9mm Upper Receiver. Matador Arms Mat9 7.825 in 9mm Upper Receiver. As Low As $575.00 Save Up to $24.00. View Product.Matador Arms Mag-X for P-320 $ 140.00 Add to cart; Main Bolt Refresh Kit $ 35.00 Add to cart; SKS Full Length Optics Rail $ 99.99 Add to cart; Shop; Shopping Cart; Checkout; My Account; Who we are! Menu. Shop; Shopping Cart; Checkout; My Account; Who we are! Call: 707-416-8847 Email: [email protected]. Address:Jan 12, 2023 · The MAT-9 complete 9mm upper from Matador Arms is available now with a price tag of $600. Patti Miller. Patti Miller is one of the most awesome females in the tactical/firearm (or any) industry. Imagine a tall, hawt, dangerous Laura Ingalls Wilder type with cool hair and a suppressed blaster and you'll be getting the idea. Your Price: $574.99. Part Number: AU-14369. Availability: In Stock. Quantity. +. Add to Cart. Description. Matador Arms MAT-9 Upper Receiver Assembly - Gen2, Black. The MAT9 Gen2 Black features a CNC-machined aluminum receiver set that is both durable and lightweight. Functions great, looks great. - Matador Arms Mat9 7.825 in 9mm Upper Receiver. by Gregg Burke , Verified Owner from NV, United States Written on December 10, 2023. Review for Matador Arms Mat9 7.825 in 9mm Upper Receiver. Matador Arms Mat9 7.825 in 9mm Upper Receiver. As Low As $575.00 Save Up to $24.00. View Product.The MAT-9 also features a non-reciprocating reversible charging handle. The barrel is made of 4150 steel, also has a nitrided finish and is threaded with the 1/2×28 thread pitch. CZ Scorpion EVO …The MAT-9 is a blowback AR-style upper that is compatible with folding buttstocks and LRBHO lower receivers. (Photo credit: Matador Arms) According to Matador Arms, the upper is built with a tapered 4-piece trunnion system made from different materials to keep mechanical accuracy and durability.Are you a passionate quilter who wants to take your craft to the next level? If so, you may have heard about long arm quilting machines. These specialized machines are designed to ...The Montgo-9 adds to Matador’s 9mm product offering. Matador 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.4.64K subscribers. Subscribed. 8.8K views 8 months ago #pcc #mat9 #pistolcalibercarbine. #matadorarms #mat9 #pcc #pistolcalibercarbine PCC's suffer from some really …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. The Montgo-9 catching some range time with a Sig Sauer ROMEO5 mounted on top. MSRP of the Montgo-9 is $549.99.
Your Price: $574.99. Part Number: AU-14369. Availability: In Stock. Quantity. +. Add to Cart. Description. Matador Arms MAT-9 Upper Receiver Assembly - Gen2, Black. The MAT9 Gen2 Black features a CNC-machined aluminum receiver set that is both durable and lightweight.. 19th hole wheeling
6061-T6 anodized upper receiver. 4150 Lightweight Nitrided Barrel, 7.825” long, 1:10 twist, 1/2×28 threads. NATO 1913 Spec top rail. 3 Mlok slots (both sides, bottom) Compatible with LRBHO (Last Round Bolt Hold Open) lower receiver. Ready to run with a Suppressor right out of the box! The MAT-9™ 9mm upper is machined for maximum weight ...A full build Mat9 is on my list, but I've got too much other stuff ahead of it. Envious of anyone picking this up right now. Hopefully we can get another discount code in a couple months after tax time.4150 Lightweight Nitrided Barrel, 7.825” long, 1:10 twist, 1/2×28 threads. NATO 1913 Spec top rail. 3 Mlok slots (both sides, bottom) Compatible with LRBHO (Last Round Bolt Hold Open) lower receiver. Ready to run with a Suppressor right out of the box! Matador Arms the MAT-9™ , the NEXT Generation blowback 9mm AR upper receiver that is ...351. Matador Arms brought to SHOT Show 2023 their new MAT-9 blowback 9mm upper receiver assembly which is the improved version of the earlier released Montgo-9. Compared to the Montgo-9, MAT-9 has a longer barrel (7.825” vs 5.5″) and forearm yet at an overall weight of 3 lbs, it’s lighter than the Montgo-9 by about 3 oz.Matador Arms presents their latest offerings including MAT-9 upper, and complete PCC build (pistol caliber carbine), a sneak peek into the K series, and disc...There might be a step on the tip of the firing pin cause the issue. You can either file the step down or have matador arms send you a new one or order a pistol caliber ar firing pin. Hope this helps. 1. Reply. 29 votes, 20 comments. 18K subscribers in the AR9 community.The MAT-9™ 9mm AR upper is compatible with AR-9 Lower receivers in any double-stack magazine configuration: Glock ®. Sig Sauer ®. Colt® Stick Magazines. HK® MP5™. CZ ® Evo Scorpion™. With an AR-15 Lower Receiver it requires our Mag-X™ magazine conversion kit or equivalent type product such as Endomags. Some Additional Key Features:May 21, 2023 · The Angstadt MDP-9 and the Matador Arms Montgo-9 both have BCGs that cycle completely inside the upper receiver and so allow folding stocks, but they only work with Glock-mag lowers. However at SHOT 2023, Matador Arms announced a newer design, the MAT-9. It's advertised as working with pretty much any single- or double-stack 9mm …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. The Montgo-9 catching some range time with a Sig Sauer ROMEO5 mounted on top. MSRP of the Montgo-9 is $549.99. 6061-T6 anodized upper receiver. 4150 Lightweight Nitrided Barrel, 7.825” long, 1:10 twist, 1/2×28 threads. NATO 1913 Spec top rail. 3 Mlok slots (both sides, bottom) Compatible with LRBHO (Last Round Bolt Hold Open) lower receiver. Ready to run with a Suppressor right out of the box! The MAT-9™ 9mm upper is machined for maximum weight ... The Montgo-9 adds to Matador’s 9mm product offering. Matador 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.9 Dec 2022 ... Matador Arms MAT-9 results, takedown, cleaning, and re-assembly (part 2) ... AimSurplus Product Spotlight: Matador Arms MAT9. AimSurplus•1.9K ...Description. 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..