I was thinking of just using a pair of needle-nose vice-grips to remove my stripped-out bolt. That's a lot easier than soldering anything, and there's a pretty good change I'll be able to reuse the fastener. You might, first, want to try that method...
As I understand it, once that first bolt is out, you can extract the cleaning rod, then access the hex head screw under the gas block. When that last screw is removed, the block should slide forward, and the rest of the front end just comes apart.
If our rifles each has the same issue, it's probably because they use some heavy handed assembly methods in the CYMA factory. Other than one stripped fastener, my gun has no problems, and is a real treat to use.
BTW, what fore end grip do you want to put on your rifle instead?