MAT9 Other Build

More testing with 124 and 147gr. Only a few failure to ejects today. I also noticed that using the bad level gave some grief when chambering a round. Removing the mag allowed it to go into battery but still something to note. The gun ran well otherwise. I let a couple range friends fire it and they seemed to like it. One of my range friends that has show my other PCCs has the same feeling as I do, the AR9 with Kynshot 5501HD buffer feels smoother overall than the MAT9, even with the kynshot buffers in the MAT9. The Mat9 is sharper. Post range, did my normal clean up and inspection of parts. Notible wear on the ejector window and the inner frame is still wearing in.

Im happy to report that today I had an absolutely flawless range session with the MAT9 build. I reconfifmed zero on the green dot and sighted in the offset irons as well as the cheap laser. The gun ran nice and smooth. 147gr were a little smoother than the 124s. This was my first time using 147s but i feel this gun likes 147s a little better. I also dremeled out the buffer tubes and didnt not experience any failures with the buffer sticking. After all the problems, i think we are finally reliable. Will continue to test this week. I also added a phase 5 extended bolt catch i originally had on the build. Works well and no issues running it with the MAT9

Reliability is slowly increasing. Coming up on 1k rounds and its finally starting to cycle somewhat reliably. I went though 8 mags and only had less than 10 FTF or FTE issues across 8 magazines which is really good. I made sure to lube up the rails where the contact is and had minimal issues. Accuracy is good and recoil impulse is not bad. Im going to bring my angstadt build next week and see how the recoil feels back to back. Im pretty sure the buffered system is smoother.

The gun shot nice but i couldn't get it to run consistently. Continuous failure to feed issues. 5 or 6 on the first magazine. The failures to eject are not even a concern, i just want it to run consistency. I may have to send it to MA for service since i don't know what is causing the failure to feed. The resistance is still there while charging around where the trigger is. Anyway, i was able to get 314 rounds through it today, same S&B 124gr.

Dave actually gave me a call and suggested that i put a mil spec trigger in. MK3 from reddit also suggested the same and that they have been seeing issues with the Rise PCC triggers. I replaced the trigger and got her to the range. From the range count, I'm guessing you can tell that it went significantly better than the previous session. I still had some failure to feed issues but it went from every time i pulled the trigger to every 50 to 100 rounds. This was a significant improvement. I was able to get just under 350 rounds through her. On a few occasions, i had some failure to eject. Probably 7 to 8 times across the 350 rounds did it fail to eject. I increased the pace to rapid fire and letting them fly as fast as i could and the gun held up well. Accuracy was also very, The dot is not perfectly zerod in yet, but probably a few clicks from perfect. Overall, this was a really nice rance visit. The recoil is also very nice. Since my hydraulic buffers are partially working (one is stuck in the bolt), I cant fully tell what the recoil mitigation is going to be like but its slightly better than my GRS based AR9s already. This gun is so close to being amazing, once the kinks get worked out.

In her maiden voyage, I couldn't get the gun to run. It refused to feed FMJ, my standard 124 gr S&B. Here is my summary. Finally got my MAT9 (not from midway). I tried to cancel this order to move on to a dissent but my cancellation request was returned with a tracking number...since I have it now, I decided to build it out. The Build: https://builderarmory.com/builds/mat9-otherbuild Lower: Aero EPC-9, Fortis Torque Stock/Brace Setup: A3 Tactical Brace, Arm, Riser, Strike 1913 adapter, Mod1 C Internals & Controls: Rise PCC trigger, Strike safety, Strike takedown pins, Matador hydraulic buffer Front End & Muzzle: Kaw Valley Blast Shield on a Plan B mount, vertical grip Optics & Sights: Holosun 510C, Magpul offset iron sights, plus an Amazon laser because $30 Since assembling it, I’ve been obsessively hand-charging, cleaning, and lubing it to wear in the mating surfaces and build a smooth wear pattern. Here’s what I’ve run into so far: Failures to Feed (FTF): I can’t get this gun to run, whether racking it manually or live firing. It won't feed more than one round consecutively. I tried about 30 times, but getting it to reliably chamber 124gr Sellier & Bellot FMJ was completely impossible. Hydraulic Buffer Issues: The buffers installed fine, but after a short range session, they’re fully retracted and stuck tight in the bolt carrier. Twisting frees them temporarily, but they’re useless if they collapse and freeze up every time. Getting them out completely is going to be a pain. Mid-Stroke Friction: There’s a distinct drag halfway through the charge stroke. You can feel it with the upper off, but it’s way worse once mounted to the lower. That parasitic drag is almost certainly what’s killing the energy and causing the FTFs. On top of that, the recoil impulse is unimpressive. Maybe I’m spoiled because I’ve built half a dozen AR9s this year all using some form of KynSHOT hydraulic systems, but I was expecting something better than those or a lot closer to an MP5 feel. I only managed to get 9 total rounds through it today—and only 2 back-to-back. I went in with low expectations but was hoping I’d be one of the lucky ones who got a solid unit.