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Need help with MPX/jammed bolt carrier group

This is a discussion on Need help with MPX/jammed bolt carrier group within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Originally Posted by kansascity45 I'll suggest removing the upper, handguard and barrel - and then a very close/careful inspection - before deploying your hammer & ...


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Old 05-08-2017, 12:37 PM   #16
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Originally Posted by kansascity45 View Post
I'll suggest removing the upper, handguard and barrel - and then a very close/careful inspection - before deploying your hammer & dowel.

You really need to understand what that 'click' was about. This may be a clue that some components are potentially locked together and could break if force is applied.

I don't own MPX, but my MCX Carriage Assembly looks very similar. If I insert the Carriage Assembly into the upper backwards, and move CA forward until the action rod is flush with the upper's rear - the Carriage Assembly's recoil rods rear spring plate is hanging out the front of the upper.

I'm guessing that the 'click' you heard was this polymer spring plate snapping past the front of the upper receiver. If this is what's happened, simply re-aligning the spring plate with the upper should let you slide the carriage assembly out - without forcing the issue with a hammer...

Cheers
Kansascity45: Your diagnosis was right on. Did some tapping using a dowel and nothing moved. Good sense prevailed and I took it to the gunny at my LGS. He was concerned at first, but after a little study, recognized their was an alignment problem. Told me he was able to release the pressure on the spring plate, getting it re-aligned and the entire BCG came out. I told him that I had tried to knock it out, but began to think it was not going to work. Told me I was wise to stop as I would have caused a much bigger problem. Charge: $20.00 Best money I ever spent.

All is now good and lesson learned. Wife reminded me that to much "Confidence" can get you in trouble. Narrative ended with her "stay focused and go through the checklist you used to live by". I definitely drifted--"crashed and burned"--Hope my lesson will help others.

Appreciate all your help and support.
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Old 05-08-2017, 01:01 PM   #17
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Originally Posted by Scionti95 View Post
Kansascity45: Your diagnosis was right on. Did some tapping using a dowel and nothing moved. Good sense prevailed and I took it to the gunny at my LGS. He was concerned at first, but after a little study, recognized their was an alignment problem. Told me he was able to release the pressure on the spring plate, getting it re-aligned and the entire BCG came out. I told him that I had tried to knock it out, but began to think it was not going to work. Told me I was wise to stop as I would have caused a much bigger problem. Charge: $20.00 Best money I ever spent.

All is now good and lesson learned. Wife reminded me that to much "Confidence" can get you in trouble. Narrative ended with her "stay focused and go through the checklist you used to live by". I definitely drifted--"crashed and burned"--Hope my lesson will help others.

Appreciate all your help and support.
I can honestly say with 100% certainty you are not the first person this has happened to, I'm glad it worked out and enjoy the MPX.
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Old 05-08-2017, 01:59 PM   #18
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sigmpx2017: Good examples of jobs best left to a professional. As you state, this may very well be one to add to the list. Going to try the dowel stick and some light tapping, but if it does not release, your advice is well taken. Appreciate your post in trying to help me.
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Old 05-08-2017, 02:04 PM   #19
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I can honestly say with 100% certainty you are not the first person this has happened to, I'm glad it worked out and enjoy the MPX.
Icarlos: Appreciate you reminding me that I am not a "one member" club. Hope that my carelessness will serve as a reminder to others and curtail membership in the club.

Brought the weapon home and broke it down and re-assembled three times. I was making sure it was "branded" in my memory bank.

Tough lesson, humbling; but time to move on and get back out to the range with my MPX.

Thank you for your words of support.
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Old 05-08-2017, 02:15 PM   #20
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LOL!! Yeah, while I haven't made that particular mistake, I don't know how many times I've installed the Carriage Assembly, but forgot the darn Charging Handle!!??##..

I really don't like SIG's charging handles, but really haven't figured out how to load the rifle without one...

Cheers
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Old 05-08-2017, 05:38 PM   #21
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Nice!!!! Glad it all worked out well. While the dowel and hammer trick didn't work, and I didn't even think of alignment issues, although a few times today I wondered, how would it go in one way but not the other? Kansascity was spot on, and you, too for not forcing when you get that "gut feeling". I agree, good $20 spent! Having a good gun smith CAN save hundreds.

For future reference, the dowel trick works for alot of oddball things, I once had a frozen cylinder in an old Honda CB200, used a dowel and hammer lightly everynight for a week, lol. Along with marvel mystery.
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Old 05-08-2017, 06:37 PM   #22
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Yes, gut feeling and the sage advice of sigmpx2017 led me to seek the assistance of a professional. Had I possibly further lodged the BCG in the upper receiver, I would have possibly had to purchase an entirely new upper. Thus, in this case, a professional gunsmith joins the ranks of an electrician, drywall installer as well as mechanic versed in the repair of auto transmissions. Good transmission sigmpx2017. Glad I was able to "Roger" that.

Thanks to all that pitched in and offered assistance. That is what makes this a great forum.

Last edited by Scionti95; 05-09-2017 at 07:41 AM.
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