That gunsmith that did the work butchered it. The grenade ring is to slip over the muzzle, the muzzle device to be threaded onto the muzzle, the hole for the pin to be drilled, the pin inserted, and then either silver soldered or welded. The muzzle device and the grenade ring are not to be welded together. Any good gunsmith should know this. I just hope everything works out in the end.
"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
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