After the fourth Spec Op mission in each level there are gun parts as reward.
I noticed they don't always give you the parts afterwards but you do get the plasma packs.
Does anyone know why this happens?? It's taking forever to get all the parts.
Am I doing something wrong? I've tried winning the missions without using secondary or med and it still won't give me the parts.
What are the restraints to getting the parts in spec ops??