Temporarily secure the separated section with zip ties, safety wire, or even tape. If it proves to be a good shooter, get it repaired properly. i.e. soldered.
Rob,Seeing as how the JB Weld is still holding on the front part of the receiver, and it was obviously easier to do than soldering (judging by the results), do you think it might have been a good option to just redo the JB Weld on the rear part of the receiver, and if it ever cracked again, just redo it again?How did you clean the metal before using the JB Weld (and the solder)?Did you try to spread the JB Weld under the receiver, or just do the fillet on both sides?That JB Weld job looks smooth as silk. The solder job looks like a prophecy of a future RBQChicken solder job .
It groups very nicely, at least for my type of shooting. I make targets out of paper plates, marking nickel-sized bulls-eyes with a black magic marker and shooting at 12 yards. That's about the distance I take pests at.7 shots in a row in the bulls-eye. It doesn't always shoot that well, but neither does my other Blue streak, and I suspect when it's not shooting well it's because of me. Some days my eyesight is more clear than other days, and I'm just steadier and more confident some days, too. On those days, good groups.