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Sig MCX Failure

This is a discussion on Sig MCX Failure within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Pretty interesting.... NOT my video! Credit goes to Nutnfancy You Tube You Tube...


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Old 10-26-2016, 08:08 PM   #1
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Sig MCX Failure

Pretty interesting....

NOT my video! Credit goes to Nutnfancy

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Old 10-27-2016, 04:20 AM   #2
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that's not good
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Old 10-27-2016, 04:48 AM   #3
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Yep. Saw that yesterday. Nutnfancy dropped a few hints on how to improve this platform just in case the Sig guys are listening.On the good side is that the gun is a solid performer of it weren't for that little problem.
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Old 10-27-2016, 12:07 PM   #4
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Good vid, thanks for posting!! That recoil rod & spring capture end piece has been a worry. You see, it's easy to re-assemble MCX BCG without properly seating the rod into the capture assembly. This error is also easy to overlook, since the rod clips into a groove that's both tiny & on the underside for the capture piece.

Am guessing NFP simply re-assenbled this BCG with the recoil rod's end stuck on the capture piece, but not snapped into the capture groove.

MCX operators really need to double check their recoil rod & spring end piece with every re-assembly...

Cheers
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Old 10-27-2016, 12:24 PM   #5
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Quote:
Originally Posted by kansascity45 View Post
Good vid, thanks for posting!! That recoil rod & spring capture end piece has been a worry. You see, it's easy to re-assemble MCX BCG without properly seating the rod into the capture assembly. This error is also easy to overlook, since the rod clips into a groove that's both tiny & on the underside for the capture piece.

Am guessing NFP simply re-assenbled this BCG with the recoil rod's end stuck on the capture piece, but not snapped into the capture groove.

MCX operators really need to double check their recoil rod & spring end piece with every re-assembly...

Cheers
Saw this video yesterday as well (I sub to his channel). I will need to remember this for when I finally get that MCX 9" 300BLK AR conversion upper that's on back order....

Still waiting Sig...whenever you are ready....seriously guys...
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Old 10-27-2016, 05:06 PM   #6
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For those who like to read manuals, Sig does go into great detail on the proper way of getting the spring and guide rod properly installed.
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Old 10-27-2016, 11:54 PM   #7
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Quote:
Originally Posted by kansascity45 View Post
Good vid, thanks for posting!! That recoil rod & spring capture end piece has been a worry. You see, it's easy to re-assemble MCX BCG without properly seating the rod into the capture assembly. This error is also easy to overlook, since the rod clips into a groove that's both tiny & on the underside for the capture piece.

Am guessing NFP simply re-assenbled this BCG with the recoil rod's end stuck on the capture piece, but not snapped into the capture groove.

MCX operators really need to double check their recoil rod & spring end piece with every re-assembly...

Cheers
That is my thinking as well. Like you and others probably did, I took mine apart and tried to see how the spring could have escaped the rod and end cap assembly and I'm betting he did not have it snapped in properly. It can still be considered a flaw if the design makes it susceptible to that particular mistake but as Spiritfox already said...
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Old 10-29-2016, 09:19 PM   #8
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It was reassembled incorrectly. You can see in this picture that the other rod, which hasn't slipped out, is not inserted into the cap correctly.
Attached Images
File Type: jpg sigmcxjpg.jpg (83.8 KB, 72 views)
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Old 10-29-2016, 10:52 PM   #9
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although it appears to be user reassembly error, sig should put some more r&d time and money into making it idiot proof because i know if i ever get an mcx i would probably do the same thing lol.
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Old 01-04-2017, 03:56 PM   #10
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Here's Nutnfancy's update on his MCX rifle - He's not bailing!!

https://youtu.be/fiUavjHbfd8

Cheers
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Old 01-04-2017, 07:00 PM   #11
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Originally Posted by kansascity45 View Post
Here's Nutnfancy's update on his MCX rifle - He's not bailing!!

https://youtu.be/fiUavjHbfd8

Cheers
All reviewer's get paid not to bail!!!
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Old 01-05-2017, 02:33 PM   #12
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Like Nutnfancy or not, you should know that he doesn't get paid to do his reviews from any manufacturers. Some guns he buys with his own money but most come from loaners from a handful of retailers he has a good relationship with. I believe I remember him saying in his initial MCX review that it was one that he purchased himself. I may be wrong and I'm currently on an airplane so I can't stream the video to find out for sure.
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Old 01-05-2017, 03:21 PM   #13
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Yeah he comes across as pretty honest to me. I don't think he would compromise his reviews by taking stuff or doing under the table deals. He at least talks about that a lot, true or false?
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Old 01-06-2017, 04:25 AM   #14
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If you go back to his original MCX review video, he extensively shoots the MCX upper on an AR-15 lower without the conversion/support piece for the recoil rod assembly.

Not surprised the end cap failed.
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Old 01-06-2017, 08:55 AM   #15
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Quote:
Originally Posted by Surtur View Post
although it appears to be user reassembly error, sig should put some more r&d time and money into making it idiot proof because i know if i ever get an mcx i would probably do the same thing lol.
Looks like the GEN II's have that end cap pinned and the earlier models will get the newer pinned Gem II assembly as part of the recall. I have a GEN II MPX which has the same assembly only smaller and it is a little tricky field stripping that assembly, compressing the springs and installing the rods back in that end cap. I'm always afraid I'm going to bend a spring.
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Last edited by MLC7; 01-06-2017 at 08:59 AM. Reason: added more
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