John, On the rollers, I am unclear on what you mean. I though that before when I had asked this question, you said that it would not work because the rollers don't set head space, its the roller pins? Did something change in your understanding of the impact that MG42 rollers have on headspace?
I am not clear on the difference between the rollers and roller pins that you mentioned in an earlier post, So if I put the rollers in an electric drill (the chuck of a small drill press) and using the valve grinding compound on them, where do I need to grind? The portions that sticks out on the top and bottom of the bolt? Is this portion what you are calling the roller pins? Or do I grind the part the sticks out on the sides? viewtopic.php?t=11957
Waffentag » Thu Sep 28, 2017 11:15 am
"Will replacing the rollers on an MG42 change the headspace?
I was able to tighten up the head space on my PTR91/G3 by swapping out the rollers. would this work for the MG42? But, they make rollers in different sizes for the G3.
Re: Replacing locking rollers"
Postby JBaum » Thu Sep 28, 2017 4:55 pm
"Different bolt/roller design. The rollers themselves don't set the headspace on a 42, it is the roller pins. With a 42 bolt, the roller pins can't be a different diameter, because they wouldn't fit right in the bolt head if they were."