A buddy contacted FN Herstal-USA (FNH-USA) about the M240 GPMG threads and received this reply today.
Originally Posted by :
M240 Barrel thread pitch is English non-standard. The call out is (25/32) 0.7812-24 UNS-3A Special. So while the pitch is a standard 24 threads per inch, the diameter is non-standard.
I hope this helps!
Bob Ailes
Customer Support Manager
703-288-3500 ext. 122
roberta@fnhusa.com
I miss shooting the pig. I don't miss cleaning it though..
I didn't find it too hard. Found the C6 to be a little less forgiving on how clean it needed to be when turning it in, unlike the rifle. Let's bend the gas tube to show the crud under it, you better scrap the carbon off the crown.