m4 mag feeding problem

[o2slick]

I have been searching around and can't find any solution. I just bought a box of brandnew king arm m4 120 rd bb. None of them are working. I have seen other post solving the problem by cutting of the edge of the sharp part that hold the bb but my problem is that the spring doesn't push the bb out because when i shake the mag i can heard the bb shaking. So i open the bottom and pull out the spring nothing broken and in good condition but it seem that it's stuck or something wont push the bb out.

I tried using silicon and i use bb bastard.

[DarkAngel]

could be your bb's. Ive never had that problem with King arms mags. Usually the issue with KA m4 mags is that they tend to not seat well inside certain brands of receivers such as Guarder and G&P. However, I have had in the past Madbull BB's which jam inside my CA M4 mags and my CA MP5 mags (double stack). Ive stripped em apart, cleaned it, oiled it etc. I dunno, Ive used Madbulls for years and havent had these issues but i had this issue with 2 bags of Madbull .25's out of maybe 30 or 40 bags. Im using Bastards now and so far i havent had this problem anymore.