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So what else do I need to mount the OMG9K on the MPX? Does it use a tri-lug? Again, I'm not familiar with the pistol suppressor or really what the piston thing is all about
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The factory MPX barrel has an M13.5 thread pitch. You basically have three ways to mount the Omega 9K to your MPX:
1. Tri-lug: you have three options here, all of them requiring that you purchase a tri-lug adapter from SilencerCo, Griffin, or Rugged.
A. Buy an M13.5 tri-lug mount from Griffin.
B. Buy a tri-lug barrel from In Lead We Trust.
C. Turn your barrel down to 1/2x28 and get one of the readily available tri-lug mounts.
2. Direct thread mount with an Octane M13.5 direct thread mount which you will have to purchase separately.
3. Piston mount using an M13.5 piston and a fixed barrel spacer. DO NOT use the spring when on the MPX as doing so may damage your suppressor.
I think the most cost-effective solution for you to suppress both the MPX and your Glock is Option 3. You'll have to get a piston for your Glock anyway. If you get a Glock threaded barrel with M13.5 threads, you can use the same piston for both. Again, just remember to use the included spring for the Glock; exchange the spring with a fixed barrel spacer (purchased separately) for the MPX.
For the MPX I went with the unnecessarily expensive route of an ILWT 4.5" tri-lug & threaded barrel and a Rugged tri-lug mount. It locks up real tight and functions as expected. The barrel is terrific but expensive.
For the Glock I went with a SilencerCo threaded barrel (1/2x28 threads) and bought a SilencerCo piston to go with it.