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SIG SAUER - MCX Mandatory Carriage Assembly Replacement Program

This is a discussion on SIG SAUER - MCX Mandatory Carriage Assembly Replacement Program within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; 27 CFR 478.124(a) states that a 4473 is not required when returning to the same person either a repaired firearm or a replacement firearm. sending ...


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Old 03-20-2017, 11:04 AM   #436
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27 CFR 478.124(a) states that a 4473 is not required when returning to the same person either a repaired firearm or a replacement firearm. sending a changed serial back through an FFL is not required by law. Doesn't mean they won't force you to do it, things being what they are these days.
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Old 03-20-2017, 11:24 AM   #437
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Yeah, it's actually 26 CFR 178.124(a), but I don't think SIG is gonna ship to you a new gun directly.

But, we're way off this thread's MCX recall subject. Suggest that if you'd like to continue this topic, perhaps a new thread in the NFA Forum is appropriate...

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Old 03-20-2017, 02:19 PM   #438
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Just got mine back and it has black nitrite NOT the original NBC. Called cust service and sounds like I'm pretty much out of luck if I want NBC.
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Old 03-21-2017, 03:18 AM   #439
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Quote:
Originally Posted by cdavis View Post
That is so, I've sent two rifles back for warranty work (one is the MCX) and it's door-to-door both ways. No FFL involved.
PLEASE READ ENTIRE THREAD. Talking about "replacement" not REPAIR.

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Old 03-21-2017, 07:26 AM   #440
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LOL, welcome to the forum!

Tip: No need to read the entire thread. Just read the title, it leaves much more time to play thread-cop.

KC already politely clarified his thought and even nudged the discussion back in the direction of the main topic.
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Old 03-21-2017, 09:20 AM   #441
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Mine is on the way via Fedex Ground arriving next Monday. Coast to coast ground shipping, boo...

Been shooting my self built AR suppressed in the mean time and man that sucker gets dirty (in comparison to a gas piston gun).


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Old 03-21-2017, 12:15 PM   #442
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Quote:
Originally Posted by cdavis View Post
LOL, welcome to the forum!

Tip: No need to read the entire thread. Just read the title, it leaves much more time to play thread-cop.

KC already politely clarified his thought and even nudged the discussion back in the direction of the main topic.
Sorry if offended, that seems to be happening a lot these days.

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Old 03-22-2017, 08:02 AM   #443
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[Edit] moving the question to the general forum

Last edited by cdavis; 03-22-2017 at 09:03 PM. Reason: moved to more appropriate forum
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Old 03-24-2017, 02:12 PM   #444
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So I finally get my carrier back. Put it all together. But can't close the upper. Hammer hits the rear of the firing pin. I have to cock the hammer back to close.

Sig says this is normal. And I should be cocking the hammer back all the time when breaking it open/close. ? (SSA-E Trigger)
Attached Images
File Type: jpg mcx carrier.jpg (344.1 KB, 60 views)

Last edited by Ed Blown Vert; 03-25-2017 at 08:01 AM.
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Old 03-24-2017, 03:41 PM   #445
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AFAIK, the hammer should always be down when re-assembling the lower and upper (on my AR and SCAR too).

(I also always put the safety on before breaking the rifle down)

Does it cycle fine otherwise?


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Old 03-24-2017, 04:15 PM   #446
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I have never had to cock the hammer on any of my rifles when breaking them open/close.
So just wanted to check before I go out a test fire with the new carrier.
It seems to cycle fine. Charges, safety works. Trigger seems to work fine.
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Old 04-01-2017, 09:49 AM   #447
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BCG versions

Quote:
Originally Posted by Duckman View Post
I'm just telling you what I was told. He implied they do have an updated SSA.
I was told they have two versions of the BCG. One that works with the SSA and the other that works with the original Sig trigger. Unfortunately I don't know what's true and what isn't anymore as I get so many different stories from Sig's customer service. Just have to wait and see.
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Old 04-01-2017, 03:31 PM   #448
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Quote:
Originally Posted by Ed Blown Vert View Post
So I finally get my carrier back. Put it all together. But can't close the upper. Hammer hits the rear of the firing pin. I have to cock the hammer back to close.

Sig says this is normal. And I should be cocking the hammer back all the time when breaking it open/close. ? (SSA-E Trigger)
Just got my rifle back too and mine does the same thing. Have to cock the hammer to get it to close. I've had this happen on AR's too, not all, but a few. I sent the rifle back with the original trigger.

I had to send my whole rifle in, because I have one of the first ones out. They replaced my whole upper with the .300BO and sent a new .223 barrel. Lower was only modified at the buffer area, as far as I can tell. They put a different buffer pad in.
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Old 04-03-2017, 11:50 AM   #449
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SIG SAUER - MCX Mandatory Carriage Assembly Replacement Program

Quote:
Originally Posted by mcnorth View Post
I was told they have two versions of the BCG. One that works with the SSA and the other that works with the original Sig trigger. Unfortunately I don't know what's true and what isn't anymore as I get so many different stories from Sig's customer service. Just have to wait and see.


Greetings ... the BCG is identical ... the only difference is the "Firing Pin Lock" => one has a "G" on it to be used with Geissele trigger - the other one is used with the OEM SIG trigger.
If you change triggers call SIG and the will send you the correct "Firing Pin Lock"
I will post pictures as soon as I get to the ballistic stick

Regards
Difference between Firing Pin Lock for Geissele trigger (top) and SIG OEM (bottom)


Geissele trigger installed => it is also marked with a "G"

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Last edited by electricjet; 04-03-2017 at 06:35 PM.
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Old 04-04-2017, 10:13 AM   #450
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SIG SAUER - MCX Mandatory Carriage Assembly Replacement Program

Shot my MCX this past weekend. Everything worked good. Didn't notice any scoring to the upper and firing pin retaining pin wasn't sticking out too far.

Noticed the recoil springs are stiffer (new perhaps?). Also, a bit harder to close the upper and lower since the plastic spring cup needs to be pushed in a bit to clear.

Shot a couple of mags suppressed and unsuppressed and functioned flawlessly.


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