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New Member and MCX Issue

This is a discussion on New Member and MCX Issue within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Gotcha, my buffer's attached with a 1/8th hex head screw. I use a key tool so as not to put too much torque on this ...


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Old 03-18-2017, 01:52 PM   #16
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Gotcha, my buffer's attached with a 1/8th hex head screw. I use a key tool so as not to put too much torque on this screw. A dab of grease on its threads should hold it tight with no more than a snug hand tightening.

Cheers
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Old 03-20-2017, 04:33 PM   #17
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Awesome pics - my buffer is definitely a different color than the one in the photos.

I called Sig today and explained the issues. They sent me a return label and RMA number, so back to New Hampshire she goes.

I also noticed a small gouge in the cam pin track of the upper receiver just behind the steel insert. Also, the manual says the recoil rods should be pinned, but they are not on my carrier assembly. There is a small bit of wear on the firing pin retaining pin as well.

Sig quoted 3-4 weeks turnaround so hopefully all will be fixed.
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Old 03-20-2017, 09:13 PM   #18
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Yeah, my recoil pins aren't pinned either.

Sent back my rifle today after talking with SIG CS. He was super helpful and took down notes. He quoted around 3 weeks. I believe SIG is trying to make everything right. They want you to be pleased with a reliable rifle. I really hope all will be fixed.....
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Old 03-21-2017, 03:28 PM   #19
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Quote:
Originally Posted by Rutherford2 View Post
Awesome pics - my buffer is definitely a different color than the one in the photos.

I called Sig today and explained the issues. They sent me a return label and RMA number, so back to New Hampshire she goes.

I also noticed a small gouge in the cam pin track of the upper receiver just behind the steel insert. Also, the manual says the recoil rods should be pinned, but they are not on my carrier assembly. There is a small bit of wear on the firing pin retaining pin as well.

Sig quoted 3-4 weeks turnaround so hopefully all will be fixed.
Good!! SIG well get ya fixed!! Couple thoughts for ya. Your lock back issue will be resolved, NO problemo!! SIG will probably consider the 'small gouge in the cam pin track' as normal wear though. They did replace my MCX upper receiver, but its wear was significant.

This cam path upper gouging is an issue with all piston driven ARs. I have 4 AR piston uppers and they all have it. In my SIG516 with 100 rounds, it's a small wear mark, and 516 with 1,000rds, it's a gouge along most of the cam path. PWS AR10 shows the same wear.

I've recently, as well as a bunch of fellow Sig Talkers switch all my standard cam pin to POF's Roller Cam Pin. This roll pin provides immediately smoother action you'll notice with your charging handle, and almost no upper receiver gouging. Sorry if I sound like a POF salesman, but these are pretty neat tricks

https://pof-usa.com/shop/upgrades-ac...-cam-pin-p415/

Another point of confusion is the new Carriage Assembly's recoil spring rod's plate. Yeah, the original Dec 22 '16 recall flier did describe these rods as pinned into the end plate, and not a removable part. BUT, that's not what has been installed with these new Carriage Assemblies. There is NO change to this plate, and the rods are still just snapped-in.

So, be very careful when reassembling these recoil spring rods into this plate, to make sure both rod ends are securely snapped into place!!

Also, should mention that I've sent MANY guns back to Exeter - many times. I own ~20 SIG pistons & rifles, and can think of only 1 or 2 that haven't made at least one trip back to NH - although there are several that have made >1 trip too. Heck, my local Fedex folks probably think I'm the state patrol's armorer or something!!

It's probably my combination of frequent range times, and perhaps being a little OCD too. But it's nothing to worry about - They usually return these guns in better shape than I sent, and on a faster turn-around than I expected...

Cheers
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Last edited by kansascity45; 03-21-2017 at 03:30 PM.
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Old 03-21-2017, 03:35 PM   #20
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Old 04-05-2017, 02:15 PM   #21
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Hey folks! Got the MCX back today and figured I'd write a quick update.

Sig's write up stated that they replaced the buffer with the updated version and mentioned that the firing pin retaining pin wear was normal and would even out. So if you've got an orange colored buffer with the new BCG, it definitely needs to be replaced.

They didn't say anything about the receiver gouge behind the steel track, so I guess it wasn't significant enough. I went ahead and replaced the cam pin with the POF rolling version, so we'll see how that holds up.

The rifle locks back like it's supposed to so I think it's time to go shooting! I haven't fired a single round through it yet...
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Old 04-05-2017, 04:04 PM   #22
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Old 04-06-2017, 09:34 PM   #23
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my mcx is due for delivery tomorrow. spoke with CS last week and it has been test fired with no issues. they replaced the orange bumper with a compatible one. Probably the one you have kansascity. not going to celebrate until I head out to the range......
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