Good to hear! They are GTG. I think Del-Ton's are the unsung secret in the barrel world.
Shooting 100 yards at a 100 yard target? If so, your a better Marksman than me! I always say my Del-Ton barrels shoot better than I can.
I never use bags or skids to zero rifles. I believe in zeroing in how you're normally going shoot, but that's me.
What type of barrel or rifle do you have... 16" Middy LW or Heavy, M4 Carbine-type, CL or not, or something else? We always like pictures
Sorry about your BIL's rifle.
Sometimes builds need a little fiddling with buffers to run good on certain configuration builds. Sometimes an O-Ring in the BCG is needed or not needed.
I hope he was using a US factory, brass and 5.56 rounds. I'm sure he was frustrated. He'll get it running right.
Thank goodness mine all run great and never have had problems.
Congrats on yours!
me