Help!!!! I sheared my index pin

[Kaveman×39]

I was removing my 20" odin works barrel from a colt upper i had installed it in and I found the index pin had sheared is this something I can fix my self do I need it/can I install the barrel with out if I use my magpul bev block? I have access to my welding metal shop if need be. Or should I send it to a gunsmith?
Note I am a welder metal worker by trade so I feel confident in fixing not sure if its woth tackling my self or I should send it off to a gun smith