r/MPX

This is my first ever PCC and first time using everything on the gun. I was blown away by how nice the trigger is and how accurate this thing shoots!

I had frequent malfunctions for the first 100 rounds with the PTR Vent 2. The owner at the shop told me this is a common issue with titanium 3D printed can. He cleaned it twice for me and after I shot 100 rounds seems shoots smoothly without malfunction now. I will definitely shoot more to make sure it’s truly working without any issues.

I was gonna order the 8inches hand guard initially. However, I actually love how this thing looks now.

I am thinking adding a remote pad switch and a laser in the future.

Just picked up this MPX (my first PCC) from a local online auction. Learning a bit more about the operating system, accessories and so on. Excited to get to shooting it soon.

I am puzzled by one detail thought that I’m not having much luck in finding in videos of takedowns or reviews etc. The lower receiver has a button high and to the rear, right in front of the side-folding brace mount. Can anyone advise what it is and its function?

Any other details, generation/model/options you know just from the photo would be appreciated.

Added the Blastphemy to my MPX AOW. Can’t take off the handguard without removing the grip now but ohh well… sacrifices are needed 😂😂

Finally have this thing set up how I like it. The last thing I need is a good FRT. Give me your recommendations.

Long story short, before I swapped barrels I was running G$ yellow springs (45% stronger than OEM) on my MPX-K. I swapped from that barrel to the adjustable ILWT SD barrel and couldn’t get it to run on max gas with any springs, not even OEM. I performed a deep clean with Hoppe’s #9 and lubricated the BCG before the swap.

Here’s the strange thing: even after swapping back to the OEM barrel, I’m getting less gas. I can’t run my G$ recoil springs anymore, the gun will only cycle on OEM recoil springs.

This makes me think it was an error on my part in either barrel installation or cleaning. It is also worth mentioning that I lost my barrel nut during the swap and had to purchase a replacement from Sig… though I doubt that would be the cause for undergassing.

Any insight on this? I’m well aware that it probably isn’t the barrel’s fault, especially given the issue with recoil springs persists with OEM springs. Any help is appreciated.

Barely fits but it fits!

Did a full break down of my 16” PCC to clean gas piston and noticed this wear at throat of the barrel (feed ramp). It’s at the bottom half of barrel chamber. The gun shoots flawless, great accuracy, no feed issues. I shoot mainly Lawman, AE, and spicier Fiocchi & Win brown box. Non-suppressed. Is this normal wear or manufacturing?

Unity riser, Holosun 510, Wolfman and other stuff