1)Yes. I have a Star G36K, and I use a combinaison of CA, TM, MAG and Star magasines...
2)Yes and Yes.
Fullsize kit is made by a lot of company, namely G&P, Star, CA...
http://www.uncompany.com/pageproduct...sp?prodid=3798
http://www.uncompany.com/pageproduct...sp?prodid=3798
"K" mod is only a stock piece made by First Factory. You can have it ordered by any canadian retailer.
http://www.uncompany.com/pageproduct...sp?prodid=3846
3)Yes. Army code receiver. you can get it in "C", "K" or full size variant. Again from any canadian retailer. Don't order yourself. It WILL get seized.
http://www.uncompany.com/pageproduct...sp?prodid=7148
http://www.uncompany.com/pageproduct...sp?prodid=7147
http://www.uncompany.com/pageproduct...sp?prodid=7149
4)No idea
5)None. Get any brand, then look around for that specific brand's problems. Usually CA=bad internals, TM= cheap, good as long as it is stock, Star=awesome, Echo1/JG=cheaper than TM, same thing otherwise...