Help wit attachments

Okay, im working on a singlpayer map wit marines. Im using marines wit no weapons so that means i need weapon attachements. I got the weapon on. i just need to put the 'fireing' attachements. If any1 noes how to, can you help me?

Im not sure i understand, fireing attachments?
Do you have your marine with no wep whatsoever, and you want to add a weapon then make it look like its shooting?

yeah. i made it have a weap but i need sometin to make it look like its really shootin.