Carry two spartan lasers
In campaign on the last level on Halo 3 when your walking up the tower while fighting the flood go to where sargent johnston is ( make sure you have at least TWO plasma or spike grenades ).
To achive this glitch you will need to stick him so he will die and drop his spartan laser, pick up his spartan laser and it should have infinite amo.
After taking his spartan laser kill him again and make sure he falls off the edge of the cliff so he respowns with another spartan laser, after he comes back to life stick him once more then take the other spartan laser with the other gun you have.
After that you should have two spartan lasers BUT beware you can only kill sargant johnston twice and if you kill him a third time he will try to kill you so I suggest you run after you pick your second spartan laser.
Gamertag : My Mum Hits Me1
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