Originally Posted by Ando
You'll be fine drilling and taping the body. It'll hold as long as you do it right.
Yeah, I haven't really beat on my stock class feed conversion, but it feels pretty stout with a simple drill and tap. If I ever tear it out, I'll go back and put a nut on top. I don't remember what screw I used now, but on something thin like that, I usually try to use a screw that is softer than the threaded hole, so that it will tear out the screw and I can just replace it.
Feed tubes make a nasty lever arm and you have to decide where you would like for it all to break off anyway, except for something like a luke's SC feed which you need to be careful what you hit with it.
The original feedneck is soldered on. A dovetail would solder on there pretty well, depending on the material. A stainless dovetail soldered on would be some kind of mean.