Have you tried both directions? The 13.5x1 was a left hand thread and the 1/2”x28 is right hand. 🤔
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The Sig Sauer website clearly says for MPX-K SIG MPX K | SIG SAUER scroll down to spec's under model number and you'll see treaded stated M13.5 x 1 mm even shows Timmey Trigger in single stage, hope this helps.I just bought a brand new (built in March 2022) Sig MPX-K model with the Timney Trigger. I called Sig shortly after my purchase to verify thread pitch on the muzzle device (birdcage) They told me it's the newest model produced and it has a thread pitch of 1/2x28, not the 13.5x1 pitch found on older models. I went to remove the birdcage and no go. I've changed out many flash hiders and muzzle breaks. That sucker is not coming off! I read it's rocsetted on there so I boiled it to no avail. I have in soaking and will try again tomorrow. I'm hoping it is indeed threaded 1/2x28 like sig told me on Thursday and not LH 13.5. I do not want to damage a brand new gun! Any insight would be helpful!
Unbelievable because I gave them the serial number of the firearm. If I didn't do that then there could have been confusion!Contrary to popular belief, OP’s experience with CS is very much like my experiences with CS until you can get to the next level. Pays to be patient.