Use it without the shield then, the gun would still be worth the 75k even if it didn't have it, it has a high rate of fire, every bullet that hits does damage instantly, and having the shield is a bonus for if your trying to get away or use it when your on low health to stop yourself from dying. The only difference is, like the new rifle it takes skill to use. If you take the time to learn how to use it you'll find it's an extremely powerful gun.