If so, then there might be other shortcuts you are likely to take. You have not listed what kit you have and yes, it might make a difference. I'm guessing it's a rifle. The biggest problem with kits, is that folks become to impatient with the material and themselves. I guess you have to define your expectations and do your best to meet them. ......I like the raw look
I want to give the barrel a stainless look and the stock a dark grey stain
So you want to take a 280+ year old design and make it look modern?
My idea might not be as extreme as some think.
Here's an example of stock/barrel combo it'll be inspired by. Maybe a tad darker on the stock.
That is a totally modern gun not a 280+ year old design. There's no correlation between the two