Braze or welding requires knowledge of the heat effect of the weld on the bolt .Front of the bolt must be kept cool and post braze/weld should be tempered.
Or use a heat-stop paste that will keep the heat from conducting towards the locking lugs. The paste is frequently used by gunsmiths when forging bolt handles or welding on bolt handles. It is available from Brownell's or from most welding supply shops.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)