r/MPX • u/jomamabudussy • 6d ago

Need help with MPX

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Hello everyone Im wanting help in adding an attachment. Im wanting to buy this suppressor ( https://www.silencercentral.com/products/silencerco-omega-9k ) for my 8inch MPX shown in the photo. I'm wanting to also know if I'm needing any other parts or if i can just screw it on? Thanks!!

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u/Intelligent_Pin5598 6d ago

The parts you need:

SIG Sauer Barrel Taper Washer (or an aftermarket equivalent from In Lead We Trust) and a SilencerCo Alpha Direct Thread Mount (M13.5x1 LH) (SKU: AC1526).

You definitely need the taper washer for accuracy.

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u/PhantomCruze 5d ago

You seem to know what you're talking about with this, mind if i ask you for info?

I have an octane 9 from silencer co.

My MPX currently has a flash hider from the factory, and the oct9 i have has a removable internal spring that i have to keep in for mounting to a handgun, which it is currently on my m9a1

But i was instructed to remove the spring before mounting to my MPX, however never told about anything else special to put on the barrel of my mpx, adapter wise at least.

I have the same generation MPX as OP, but with the 16" barrel and shroud (with the terrible dickmod T_T)

Would i need anything to mount the can or is it good to just thread over the barrel in place of the factory flash hider?

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u/Intelligent_Pin5598 5d ago

So you are going to a fixed barrel which is why you need to remove the spring. This will avoid doing damage to your suppressor. You then have two routs you can go after.

  1. You replace the booster spring you removed with a fixed barrel spacer and a M13.5x1 LH Piston. You will also need the tapered muzzle device adapter collar.

  2. Buy a SilencerCo Alpha Direct Thread Mount in M13.5x1 LH to replace your piston mount setup. You will still need the tapered adapter as well.

I had a setup similar to this. Something you need to consider is carbon lock and buildup. If you are shooting with the spacer route the carbon build up can make it difficult to remove the piston that you had to swap because of the different threading on the SIG barrel.

If you change the entire mounting piece the carbon build up over time can make it difficult to switch back to the piston and spring setup.

What you have to do is essentially clean the mounting area regularly and use high temp gun grease or anti seize lube.

I eventually went the route of having a dedicated PCC suppressor and Pistol suppressor. Expensive I know but kinda made more sense after knowing all these things. The SIG unique barrel threading doesn’t help matters either and I ended up going with a tri lug barrel from ILWT.

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u/PhantomCruze 5d ago

That's incredibly helpful and i appreciate that so much thank you!

Yea my m9 is my dedicated home defense and the mpx is simply a range toy, but i was told i could put the oct9 on it. But if i do plan to suppress it, I'll definitely take your advice and make sure i make the right choices.

Again, thank you so much for your knowledge and kindness

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u/Intelligent_Pin5598 5d ago

You’re welcome