This works for all guns, so you only have to do with one thing.
First off open CA(No really? Yeah !!!)
Next we want to find your ammo slot for the first one!
So example 30/90, we need to find 30.
Fire off some rounds search 24 or something. Get the address and do a find out what writes this address.
Go and fire off a few more rounds.
You should get maybe 5 - 6 address + their ASM code.
One of them should be mov [esi+000000e4],ecx
Left click on it and then click on Show disassmebler.
Go up 1 line and you should see dec ecx.
This means decrease ecx(Our ammo value) by 1, everytime its execute(every left click).
Now go ahead and NOP it, press delete or right click fill with nops.
Go back to CA and have fun with your No Reload.
Credits to me. Wolfe//TehWolfe.
Edit: For those noobs that don't know how to find the address. CE 5.4 or any UCE should work fine.