Assignment of Contracts Rifle Distributors assigns a $20,000

Assignment of Contracts  Rifle Distributors assigns a $20,000 claim against Top Gun, Inc., to the Zenith Col­lection Agency. When Zenith sues Top Gun, Top Gun asserts that it rejected a shipment of rifles from Franchett1 out of which the claim arose because they had defective trigger guards. Explain whether Top Gun can properly assert 1ts defense against plaintiff Zenith.