Yes they are the PLASTIC one from KING ARMS
I have 10 of them and would like to make them work if possible.
I am new to this and am not sure what you mean by file the retainer a bit.
Can you explain more or show a picture please?
As for bb's…
I have .20, .25 and .28 from elite force. I tried different sizes and its all the same.
Thanks for help
