If anyone here has any experience extending the magazine on the SA-20 how difficult is it? I see that Choate sells these and it requires some filing. Is this something an that can be done with say a metal file from Loew's or is it much more difficult than that? They way Choate packages and sells these things it would appear it is something an every day dude could perform without too much trouble....? Darth I'm not sure if your still around but it seems like you would have a good answer to this....