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    1. · Premium Member
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      If you don't want to pay the $3-4 for the o-ring these appear to be the same but at a cost of 54 cents each. http://www.amazon.com/gp/product/B005RUPDMI?psc=1&redirect=true&ref_=oh_aui_search_detailpage


      I just received 1 of 3 take down levers I ordered and the o-ring went on and installed without any problem. I did put a drop of oil on the new o-ring.
      It's funny that you bring that up because I actually broke the new O-ring as I was trying to stretch it out. I put some oil on, but maybe I either didn't wait long enough or more likely stretched it badly. Luckily, the older one came off and fit on the new TDL just fine. But yeah, I was going to head over to Home Depot or something to get more spares. So the ones you posted are the right size?
       
    1. · Premium Member
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      I just ordered these.....

      Robot Check

      Basically enough to last a lifetime even if I get more P320's.
      Caution: Neither of these worked for my P320 TDL. They don't quite fit snugly in the TDL's slot, and the TDL does not go into the frame all the way. Looks like I'll be ordering some from SIG.
       
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    1. · Registered
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      160 Posts
      I am going to put my AAC- Ti-rant 45 on my MPX this week. Will post a report asap
      I have a AAC Ti-Rant 45S with Fixed Spacer threaded with a 13.5x1LH to .578x28RH MPX barrel thread adapter (USMACHINEGUN.COM) for my Gen II 4.5" and 8" barrels. The thread adapter is attached with high temperature Rocksett all-purpose ceramic adhesive cement.

      Blowback is minimal and not an irritant. I use 9mm 147gr ammo which is subsonic by design. Since the Ti-Rant 45S is for .45ACP there is some sound reduction efficiency loss; however, it is not that apparent to the naked ear. I would expect IMHO, that you would loose about 3db with a Ti-Rant 45S versus a Ti-Rant 9 on a MPX.

      I run the Ti-Rant wet and dry. Wet using a water-base clear wire lubricant. Tap water in the suppressor tends to add to blowback for the first 2-3 rounds (i.e. burnt powder and steam); however, the water-base lubricant does not add to blowback. Use of the "wet" can does lower the db, as well as, minimizing the first round muzzle/suppressor flash (i.e. caused by burning up the oxygen in a cold suppressor).

      Another little trick is to put an O-ring on the barrel shoulder; as you screw on the suppressor, the O-ring snugs up against the barrel shoulder securing the suppressor from rotating after a couple of magazines of rounds.

      The reason I use a .45ACP can vs a 9mm is due to having other .45ACP pistols and didn't desire to purchase a 9mm can just for the MPX. However, I'm researching 9mm cans. :)
       

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    1. · Registered
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      160 Posts
      Concur, O-Ring.
      I use these: Viton

      Rated to 400 degrees F. Usually replace around 100 rds depending on rate of fire and just how hot the suppressor got. Even if the o-ring melts it is easily removed with a cleaning brush.

      Some folks use plumbers tape, but I find that it melts quickly.
       
    1. · Registered
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      Purchasing new barrels with right-hand thread is the permanent fix, but expensive.
      I have a MPX Gen II with 8" and 4.5" 13.5x1LH barrels using a AAC Ti-Rant RH suppressor.
      I purchased from USMACHINEGUN.COM left-hand to right-hand thread barrel adapters. The type of adapter you would most likely need is US Machinegun: *Sig Sauer MPX & PISTOLS 13.5x1 LH to 1/2x28 RH Thread Adapter, SIG SAUER MAGAZINES & PARTS, SIG-135TA - verify before purchase.

      1. Thread the adapter with rocksett compound to the Sig barrel using 20ft-lb torque. Allow 24 hours for rocksett to dry.
      2. Attach and hand-tighten RH suppressor to adapter mounted on barrel with a heat-resistant O-ring.
      3. The O-ring will help resist the suppressor from naturally coming loose as firing rates and round counts increase.
      4. Roughly every 1000rds, check the torque on the barrel thread adapter.

      I have over 5000rds (i.e. 1000 with 8" barrel; 4000 with 4.5" barrel) through my MPX Gen II and have had no issues with barrel or suppressor stress/fatigue. Accuracy has been consistent with and without suppressor. When not using suppressor, I just hand-thread on the SIG MPX factory A2 flash hider.
       
    1. · Registered
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      408 Posts
      The correct size o-ring for Sig P320 and variants is 1.6 x 6 mm Vitron or Burna-N works just fine. O-rings will be very tight when first installed and compress down with use.
      I just replaced the O-ring on my P320 SC take down lever with this size (M1.6mm X 6.1mm) O-ring in Vitron and it worked fine. The original O-ring had split in half. Did lightly grease the O-ring with Lucas gun grease. The take down feels and works the same as my other P320s do when I remove the take down lever.

       
    1. · Registered
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      160 Posts
      I have a MPX Gen 2 with a AAC Ti-Rant 45S suppressor with AAC fixed barrel spacer installed; yes, it is a .45 cal suppressor on a 9mm barrel. I have two barrels - 8" and 4.5" - both have a 13.5x1 LH to .578x28 MPX Barrel Thread Adapter, USMACHINEGUN.COM. I added to the suppressor an o-ring at the barrel interface that helps keep the suppressor from backing off the barrel under recoil.
      With the 8" barrel, I average 1.5" groups at 25 yards and with the 4.5" barrel 2.1" groups at 25 yards. I use 147gr 9mm Hornady and Federal ammo.

      Remove the suppressor and barrel assembly for cleaning, and the follow-up range check usually finds an average of 1" shift in POI - Re-zero and all is OK until next major cleaning. I am not seeing your problem, as described.

      There was a great deal of work to get all these LH vs RH barrel/suppressor stuff to align correctly. I have a SIG SAUER MOD-X9 suppressor currently going through the ATF approval process that alleviates barrel interface issues. Expect ATF approval in April 2022 - I hope, maybe, I assume, fingers-crossed. . .
       
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