I downloaded the no decal version and i am currently using XRM.[/quote]
XRM is 'the' Rebalance. Paul has changed many of the guns, and they have different names in some cases. Also, the Tcockpit (guns) assignments have been racialized, and balanced. So, the Tcockpits assigned to the Normandy by this mod, will show different, compatible guns in XRM.
You'd have to alter the ship in XRM to get the guns on it you want, but that would change your whole XRM game, since the changes you make, would appear game-wide.
Hope that explains it?...

Yes it does. Thanks