Originally Posted by
stencollector
If you are handy with a MIG welder, those front screws would be an easy removal. Put a small flatwasher with the appropriate size hole over the highest one, then a larger machine nut over the washer. Hit the top of the broken screw with the mig welder and fill the nut within reason with weld. You can then remove the broken screw by turning out the nut. There will be minimum heat transfer to the actual receiver...the stud will absorb it all and likely melt the solder at the same time.
If you are not handy with a mig welder, then best not try this yourself.
I have removed broken bolts, studs and screws on many items from engine blocks to gun receivers with this method, and have not had to use an extractor in a lot of years.