1) Entity
Step 1: Open up your MP map in Entity.
Step 2: Open up the campaign map that has the jackal shield in it, I used deltaaproach.
Step 3: Go to the weapon tag in the campaign map and click on jackal shield and then click the checkboxes parsed and recursive and then click save then it will say done.
Step 4: Now close the single player map and go to the mp map. In the mp map choose build and locate the .info of what you just saved.
Step 5: Now in your MP map go to the weapon tag and click on the jackal shield that you just moved into it.
Step 6: Open the Meta editor and choose show unknowns.
Step 7: Scroll down to FP models then in the drop down box to the right there should be a 0 and a 1 in it make sure you have it one 1.
Step 8: Now change the mode to "objects\weapons\melee\jackal_shield\fp_jackal_shield\fp_jackal_shield" without quotes.
Step 9: Now change the jmad to "objects\characters\mastercheif\fp\weapons\pistol\fp_plasma_pistol\fp_plasma_pistol".
Step 10: Now fix map signature, resign, and ftp to your Xbox.
I used stars45 tutorial as a template cause I was to lazy to type the whole thing.
Make sure you do it EXACTLY how it says to do it because I did this once and it worked fine.