OK, I downloaded paint shop proand created my LBM. It now looks all fluffy in game. I cannot get rid of the colour in the picture.
I am not happy with the way it looks when minimised either. I will upload the full size version and anyone who wants to help turn it into a proper LBM please, please help. It is in its origional jpeg format. It therefore is much bigger and more colourful than the desired LBM.

It is a mishmash assault rifle I designed. Part G36 and part Sig with some other HK gun traits. It looks rather nice actually.