Chivas he's talking about the code in Morpheus that gives no-reload for the mp5...
Though I thought this issue was fixed (do you have the newest version?)
Find this in the code and comment out the parts that dont have comments... 3 lines:
Code:
// Never Run Out of Ammo!
if ( clip == 0 ) {
shReloadAmmo(id)
}
then recompile it