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While they will be very similar, it will not be an exact color match with Magpul furniture. The best way to ensure color matching is to use all of your accessories from the same manufacturer.
The Daniel Defense Collapsible Buttstock Tornado model will be close to the Sig MCX Grey but a direct match in color cannot be guaranteed.
The Daniel Defense Collapsible Buttstock attaches to Mil-Spec carbine length buffer tubes. So if you LWRC rifle uses a Mil-Spec carbine length buffer tube the Daniel Defense Collapsible Buttstock will work.
From what information I could find there is not a replaceable buttpad for the Daniel Defense Collapsible Buttstock. I recommend looking at the Limbsaver Recoil pad fitment guide to see if one of their recoil pads can fit that stock. The Limbsaver fitment guide can be found on the left side of the product page listed below.
https://www.opticsplanet.com/limbsaver-sims-vib-ar15-snap-on-recoil-pad-10019.html
They are two different shades of grey.
This stock is available is either black, gray, or brown.
If the buffer tube is Mil spec it will fit.
You select the option you'd like in the dropdown menu on the product page.
Yes, as long as the buffer tube is a standard buffer tube.