Sig MCX on FA M16 lower

N

NorwegianShooter

New member
Hey. I got a couple of M16 lowers and I´m looking for the option to get at least one fitted with the new Sig MCX upper. I might opt for the SBR-option with either the sidefolder or the telescope stock. My question if really wether or not the Sig upper will run full auto seeing as it uses a different bolt carrier and being sold as civilian kits. Are the "retrofit to AR-lowers" kits already out there?
 
I would be skeptical of the legality of trying to make this work - if it requires modification to the registered lower, or even modification to the parts in the registered lower, I think ATF may frown on this.
 
The OP lives in Norway, so I don't think he cares what the ATF thinks.

His question is a technical one, not a legal one, and it's one I don't know the answer to. I'm off today, but next time I'm at work I'll take a look at the bolt on our MCX and see if I can figure it out.
 
I appreciate that.

I´m a registered collector, and they are part of two complete, unissued M16A1s. So no, I don´t really care about the ATF. We have our own problem over here, and they are called POD ;)

I don´t want to use the original uppers I have. I could just buy a standard AR upper, but where is the fun in that? The MCXs look cool.
 
Sorry, OP, I forgot to tell you that when I went back to work we were sold out of MCXs. I'll try to remember to take a look at the next one that comes in.
 
I appreciate it a lot. As far as I know, there is not a single MCX in my country so I have no way to check. If I am to go through the whole deal of importing, I really wanna know all the details beforehand, as you can understand.

I´m in a good position of having a collectors permit. You deliver a list to the authorities specifying the theme of your collection, and I get to purchase 25 weapons at a time within that theme (they can all be select fire if I choose). My theme is cold war, and there is a lot of goodies to track down. The limit is money really.
 
So we got a couple more MCXs in and I checked out the bolt carrier on one.

Unfortunately, it won't work with an auto sear; the rear of the BCG that would trip the auto sear is completely removed on the MCX.
 
Thanks a lot for looking this up for me, even though the results were negative.

Back to the think tank I suppose... I really wanted something with a folding stock :P
 
The MCX may not be cold war, but the original M16s are and I imagine the MCX is a non-regulated or less-regulated firearm which OP is trying to piggyback off of his Cold War themed registered collector's pieces
 
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