Kings Arms M14 Mag Problems
 

I have an M14, and recently purchased a package of Kings Arms Mags. Went to use it last night, and they wouldn't work. From the site that I purchased them from, it says that it might require "Minor filing maybe required to BB stopper on each mag to improve feeding". It is great to tell me this, but I can't find anything that tells me what kind of filing maybe required, or where.
Can anybody help me, as I would like to use this gun for a game on the 23rd, but right now it is a paperweight.
Thanks in advance.

I have been using King Arms Mags in my M4 for over a year and the only time that I have had feeding problem is when I loaded them full for a night game. When loaded to real mag limits I have never had a problem.

I run with KA metal lows right now and have never has a feeding problem. Its the plastic mids that do, but they are easy to fix and cost a lot less.