I propose:
COMMON WEAPONS - according to the setting [in a ork savage world, maybe primitive/ork weaponry can be common], weapon of this category is available to everyone: an eldar could turn up his nose upon a bolter but, in dire times, he'll use it.
apart from this, follow the NCE.
UNCOMMON WEAPONS - follow the NCE.
RARE WEAPONS - everybody can use these weapons but nobody except the appropriate gangs can buy them at the start.
apart from this, follow the NCE.
EXCLUSIVE WEAPONS - just the original owners can buy and use them but, under the right circumstances, rare, lucky gangers can be able to manage them.
COMMON WEAPONS - according to the setting [in a ork savage world, maybe primitive/ork weaponry can be common], weapon of this category is available to everyone: an eldar could turn up his nose upon a bolter but, in dire times, he'll use it.
apart from this, follow the NCE.
UNCOMMON WEAPONS - follow the NCE.
RARE WEAPONS - everybody can use these weapons but nobody except the appropriate gangs can buy them at the start.
apart from this, follow the NCE.
EXCLUSIVE WEAPONS - just the original owners can buy and use them but, under the right circumstances, rare, lucky gangers can be able to manage them.