Request - M590 double tap

I dont care if it has no reload or not, really i just want it to shoot 2 bullets at the same time.

I would appreciate getting this, or being told how to make it myself.

The double tap m590 already posted in forums does not work, i downloaded it, added it to my game folder, and when ever i switch to shotgun my whole screen turns grey and i cant see anything.

Been made,
http://www.mpgh.net/forum/210-combat...oad-added.html

that doesn't even work, like he said, it turns screen grey. I just tested it out and it does the same thing