Marcus and Magwedge;
Your proposed price sounds really appealing if we are comparing apples to apples - that is yours and hical's adapter being one and same. At least substantially the same as far as the most important features are concerned.
Specifically please confirm that your adapter:
1. Will work with unmodified mags as if would be illegal in Canada to modify them in any way.
2. Your adapter keeps the bolt open upon firing the last round
3. Your adapter can be used with clips
4. Comment on hical's statement (true / false / fixed) re: your adapter has an issue with mag catch binding which hical addressed by designing catch arm with a "different geometryso it can't bind"
5. Mag release button can be pushed too far "allowing the mag catch to fall out of position, this is a problem with the USA design" - again, true / false / fixed?
6. Installation prices / guides?
Hical's list contains other differences that I don't think are very important, but I would appreciate if you could shed some light on the above.