Funny you mention the finish coming off. I also have one in my mk18 and same thing happened to it. It looks like its been used for years. Really is only been in since November.
The charging handle works like a charm and I wouldn't go with other.
Like a boss!
Got them in all my AR15's and AR10 and they are a thing of beauty
http://oneclearvoice.ca/
Thanks! Got mine today and it fits fine on the Ruger SR762
There are only two types of people in this world, those who want to control others, and those who have no such desire. The former is the enemy of humanity.
Stand together. Stand strong. Don't give them an inch for they will take a mile.