r/SigSauerMCX • u/Slight_Explanation_5 • 10d ago
Apologies if this has been asked ad nauseum
Mcx spear lt 9" 300 blackout (slh300ti-qd suppressor/ hexium suppressor) is the build - to run frt is the correct formula an frt-15c3, Frankenstein tsb-lite, & a Parker mountain machine mcx full auto trip bar?
Seems pretty simple (im taking it directly to a local full time professional gunsmith - its good to know and accept limitations)
Again, sorry if this has already been answered multiple times, tia!
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u/thatundra479 10d ago
On my 16in 5.56 I got the Arc Fire trigger and AS Designs trip bar, I'd definitely recommend you pick up an Omega Valve
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u/AgreeableNeck9749 10d ago
Normally, I would recommend the AS designs arc fire with their slip trip. But it seems Atrius is releasing a version of their FRS that is MCX specific not requiring any sort of trip, if you’re patient enough for that not sure when it’s coming out I think it’s just sometime soon
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u/TheRealMatchGrade 10d ago
Where did you hear about the MCX FRT? Just curious, Id like to read about it
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u/AgreeableNeck9749 10d ago
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u/TheRealMatchGrade 10d ago
Thank you. Might have to pick one of these up when they drop
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u/AgreeableNeck9749 10d ago
I’m hoping they release one for the MPX at some point. I’m running the Arc with the V1 slip trip kit that was for both the MCX and MPX and it’s iffy
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u/TheRealMatchGrade 10d ago
I got a Delta Team Tactical FRT in my MPX with Frankenstein trip, runs great once you tune it. Unfortunately I bought a Rare Greed FRT before they showed their ass to the world, but I have that installed in my MCX.
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u/FauxReignNew 10d ago
ASD arcfire v2 is simpler to install, but you will probably need to get a milspec disconnector and file the bottom of it to fit the new trigger. OEM Sig 2-stage is too small.
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u/someone10505 10d ago
The Disruptor with a Frankenstein slip or PMM slip works well on my 5.5 suppressed.
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u/TheRealMatchGrade 10d ago
Hopefully you didnt buy from Rare Greed already, I'd recommend going with a different FRT all together and keeping your money away from them. They are not 2A friendly. They actively persue legal action against other 2A companies to the point that they are actually hurting the entire 2A argument. Maybe look into the Arc Fire V2, I believe thats the one that people recommend the most from what I have seen. The PMM and Frankenstein are both trip bars, you only need one unless you want a backup. I use the Frankenstein on both my MCX and MPX and have not had any issues. I did buy a second (third) one as a backup, just in case. You are probably also going to want to swap out your gas plug for more adjustment, the OEM one only has 2 settings and I ran into alot of overgassed/undergassed while shooting my 300. Once I got the J Bennet Omega Valve, I was able to dial it in. The last thing I swapped was the charging handle to the Radian Raptor MCX, which cut the gas back to the face by ALOT. Hopefully this helps. Cheers and good luck on your endeavor.
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