I won't be the *** on pbnation.. You can get it done by a qualified machinist named stanchy. He goes by Super Stanchy if I remember right. You can also look him up on Facebook at super stanchy customs. It costs $35 plus shipping and the turn around is "2 weeks" but it's always before that. He has bored hundreds and hundreds of dye UL barrels with great success. Check him out!
"It's about being a Hostile Kid."